Method for treating or preventing psychoimmunological disorders

ABSTRACT

A tachykinin receptor antagonist is useful for treating or preventing a psychoimmunological disorder in a patient.

This application claims priority to provisioned application serial No. 60/067,095, filed Dec. 1, 1997.

BACKGROUND OF THE INVENTION

The fact that psychologic stress can precipitate or alter the course of organic diseases has long been recognized. An essential challenge in psychosomatic-psychobiological research is to delineate the mechanisms by which experience causes certain types of physiological reactions that result in disease states. In addition, the mechanisms of neurobiological modulating systems need to be understood at the molecular and genetic levels. Recent and ongoing developments in cellular and molecular biology provide some research models by which transducing mechanisms involved in psychosomatic reactions can be understood at the most fundamental level. It has been suggested that anxiety can occur as a result of acquired neurophysiological chemosensitivity. Stimuli that produce "chronic anxiety" in the sea snail aplysia cause the enhancement of connections made by the sensory neurons on their target cells--that is, interneurons and motor neurons. The enhancing process, deemed postsynaptic facilitation, is caused by noxious stimuli that activate cells that use a serotonin-like neurotransmitter. Those cells on the head of the aplysia act as a defensive arousal system, impinge on the synaptic terminals of the reflex system for gill withdrawal, and enhance the connections that the sensory synapses make on the motor neurons and interneurons. Serotonin appears to play a major role in the defensive arousal process by increasing intracellular cAMP, which then strengthens the neuroconnectors of the sensory neurons by facilitating neurotransmitter release. In accordance with the present invention, substance P has been found to play an important role in the inducement of disease states by psychobiological reactions.

With respect to psychoimmunologic disorders, interest in the interactions between the central nervous system and the immune system date back to Aristotle, who hypothesized a connection between physical health and mood. Later, Sir William Osler spoke of the importance of knowing what is going on in a patient's head, as well as the lungs, in predicting the outcome of pulmonary tuberculosis. During the mid 1950s Selye demonstrated a clear relation among brain activity, endocrine organs, and immune function. In 1964 the field was first referred to as psychoimmunology, later amended to psychoneuroimmunology, the study of the interaction of consciousness, the brain and the central nervous system, and the body's immune system. In recent years major advances have been made in establishing direct evidence for a brain-immune system relation. In serving functions of adaptation and defense, both the central nervous system and the immune system discriminate between self and nonself, and they incorporate principles of recognition, learning, memory, and transmission of information. Evidence for such a communication system ranges from anatomical confirmation of the central nervous system innervation of immune organs to reports documenting the behavioral effects on immune response and tumor acquisition in experimental animals. A number of studies involving experimental animals and human autopsy specimens have shown direct sympathetic nervous system innervation of the spleen, the thymus, and the lymph nodes. Cholinergic innervation of the thymus gland has now been documented, and investigators have described noradrenergic innervation of lymphoid tissue in a variety of mammalian species, including humans.

Lending further evidence is the presence of receptors for various neurotransmitters, neurohormones, and neuropeptides on cells of the immune system. In particular, neurokinin receptors have been found in lymphatic tissue. Noradrenergic receptors have been found on lymphocytes that appear to be exclusively for beta2-adrenergic receptors, which are similar to those found in the smooth muscles of the bronchi and the lungs. In addition to the noradrenergic receptors of the beta-1 subtype, evidence indicates the presence on lymphocytes of receptors for gonadal steroids, endorphins, enkephalins, corticotropin, vasointestinal peptide, cholecystokinin, neurotensin, acetylcholine, and serotonin. Recent evidence also indicates that lymphocytes may synthesize some neurohormones de novo.

Although some studies suggest that bereavement and depression can interfere with immunological competence, the findings in this area of research have been diverse and often inconsistent. Studies of bereaved men and women have reported reduced in vitro lymphocyte response to mitogen stimulation, with normal levels of circulating immunoglobulins and normal responses on delayed hypersensitivity skin tests; the reduced lymphocyte response is most dramatic in bereaved patients with depressive symptoms. A recent meta-analysis of methodologically sound studies addressing cellular immunity in depression found that the immune abnormalities reliably associated with depression were (1) decreased proliferative response of lymphocytes to mitogen stimulation, (2) decreased natural killer cell activity, and (3) abnormalities of different white blood cell lines. The magnitude of these immune system abnormalities correlated with the intensity of depressed mood. However, methodological concerns limit the interpretation and generalizability of much of the available data on the immune system in depression; there is a high incidence of failure to replicate findings.

Although the present invention is not limited to a specific mechanism of action, the inventors postulate that a potential explanation for some of the diverse findings may involve high catecholamine output and the increased production of prostaglandins, each of which has been observed separately in studies of depressed patients. Catecholamines, acting through beta-adrenergic receptors, are known to suppress the activity of human natural killer cells. Prostaglandins, functioning through a complex interaction between second messenger systems, may inhibit in vitro mitogen-induced lymphocyte proliferation. Because recent animal work suggests that prostaglandin production is increased by catecholamines through a nonreceptor-mediated mechanism, the diminished immunological competence reported in depressed patients may be a result of the dysregulation of the catecholaminergic system. In accordance with the present invention, the neuropeptide substance P is postulated to play in important role in this mechanism. Accordingly, a tacykinin antagonist, in particular a neurokinin-1 receptor antagonist would be useful in the treatment or prevention of a psychosomatic disorder or a psychoimmunologic disorder.

Antidepressant and antianxiety agents have been employed for psychosomatic or psychoimmunologic disorders with limited success. In addition, certain side effects may be present with such treatment. These approaches have had limited success, however, and an alternate means of treating or preventing psychosomatic or psychoimmunologic disorders would be of great benefit.

The neuropeptide receptors for substance P (neurokinin-1; NK-1) are widely distributed throughout the mammalian nervous system (especially brain and spinal ganglia), the circulatory system and peripheral tissues (especially the duodenum and jejunum) and are involved in regulating a number of diverse biological processes. This includes sensory perception of olfaction, vision, audition and pain, movement control, gastric motility, vasodilation, salivation, and micturition (B. Pernow, Pharmacol. Rev., 1983, 35, 85-141). The NK-1 and NK-2 receptor subtypes are implicated in synaptic transmission (Laneuville et al., Life Sci., 42, 1295-1305 (1988)).

Substance P is a naturally occurring undecapeptide belonging to the tachykinin family of peptides, the latter being so-named because of their prompt contractile action on extravascular smooth muscle tissue. The tachykinins are distinguished by a conserved carboxyl-terminal sequence. In addition to SP the known mammalian tachykinins include neurokinin A and neurokinin B. The current nomenclature designates the receptors for substance P, neurokinin A, and neurokinin B as neurokinin-1, neurokinin-2, and neurokinin-3, respectively.

Substance P is a pharmacologically-active neuropeptide that is produced in mammals and acts as a vasodilator, a depressant, stimulates salivation and produces increased capillary permeability. It is also capable of producing both analgesia and hyperalgesia in animals, depending on dose and pain responsiveness of the animal (see R. C. A. Frederickson et al., Science, 199, 1359 (1978); P. Oehme et al., Science, 208, 305 (1980)) and plays a role in sensory transmission and pain perception (T. M. Jessell, Advan. Biochem. Psychopharmacol. 28, 189 (1981)).

Neurokinin-1 (NK-1; substance P) receptor antagonists are being developed for the treatment of a number of physiological disorders associated with an excess or imbalance of tachykinins, and in particular substance P. Examples of conditions in which substance P has been implicated include disorders of the central nervous system such as anxiety, depression and psychosis (see, for instance, PCT Patent Publication Nos. WO 95/16679, WO 95/18124 and WO 95/23798). More recently, PCT Patent Publication No. WO 96/24353 suggests that a more efficacious and safe treatment of psychiatric disorders would be achieved using a combination of a tachykinin antagonist and a serotonin agonist or selective serotonin reuptake inhibitor (SSRI). However, such as regimen would not be free of side-effects due to the serotonin agonist or SSRI. Currently there are only limited means for treating or preventing psychosomatic or psychoimmunologic disorders. In view of the short-comings of existing agents, there is a need for new effective methods for treating or preventing psychosomatic and psychoimmunologic disorders.

SUMMARY OF THE INVENTION

The present invention relates to the use of a tachykinin receptor antagonist, in particular a neurokinin-1 receptor antagonist, for the treatment or prevention of a psychosomatic disorder or a psychoimmunologic disorder or the amelioration of symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder comprising the administration of a tachykinin antagonist, in particular a neurokinin-1 receptor antagonist. In a preferred embodiment, the present invention provides a method for treatment or prevention of a psychosomatic disorder or a psychoimmunologic disorder or the amelioration of symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder comprising the administration of a tachykinin receptor antagonist, in particular a neurokinin-1 receptor antagonist.

DESCRIPTION OF THE INVENTION

The present invention is directed to a method for treating or preventing a psychosomatic disorder in a patient comprising the administration of a tachykinin receptor antagonist, in particular an NK-1 receptor antagonist.

The present invention is further directed to a method for treating or preventing a psychoimmunologic disorder in a patient comprising the administration of a tachykinin receptor antagonist, in particular an NK-1 receptor antagonist.

The present invention is further directed to a method for ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient comprising the administration of a tachykinin receptor antagonist, in particular an NK-1 receptor antagonist.

In a preferred embodiment, the present invention provides a method for treating or preventing a psychosomatic disorder in a patient comprising the administration of a tachykinin receptor antagonist, in particular an NK-1 receptor antagonist. In a more preferred embodiment, the present invention provides a method for diminishing or severing the detrimental influence of psychological stimuli in a disease or disorder for which the physical etiology is contributed to directly or indirectly by psychological factors.

In a preferred embodiment, the present invention provides a method for treating or preventing a psychoimmunologic disorder in a patient comprising the administration of a tachykinin receptor antagonist, in particular an NK-1 receptor antagonist. In a more preferred embodiment, the present invention provides a method for diminishing or severing the direct or indirect detrimental influence of psychological stimuli on the immunological state of a patient by employing an NK-1 receptor antagonist.

In a preferred embodiment, the present invention further provides a method for ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient comprising the administration of a tachykinin receptor antagonist, in particular an NK-1 receptor antagonist.

The present invention further provides a pharmaceutical composition for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder in a patient comprising a tachykinin receptor antagonist, in particular an NK-1 receptor antagonist, together with at least one pharmaceutically acceptable carrier or excipient.

The present invention further provides a pharmaceutical composition for ameliorating the symptoms attendant to a-psychosomatic disorder or a psychoimmunologic disorder in a patient comprising a tachykinin receptor antagonist, in particular an NK-1 receptor antagonist, together with at least one pharmaceutically acceptable carrier or excipient.

In accordance with the present invention the tachykinin receptor antagonist is administered to a patient in a quantity sufficient to treat or prevent the symptoms and/or underlying etiology associated with the psychosomatic or psychoimmunologic disorder in a patient.

In a further aspect of the present invention, there is provided a pharmaceutical composition for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder in a patient comprising a NK-1 receptor antagonist, together with at least one pharmaceutically acceptable carrier or excipient.

In a further aspect of the present invention, there is provided a pharmaceutical composition ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient comprising a NK-1 receptor antagonist, together with at least one pharmaceutically acceptable carrier or excipient.

The present invention also provides the use of a NK-1 receptor antagonist for the manufacture of a medicament for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder in a patient.

The present invention also provides the use of a NK-1 receptor antagonist for the manufacture of a medicament for ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient.

It is well recognized in the art that psychological stimuli can precipitate or alter the course of numerous diseases or disorders. As used herein a "psychosomatic disorder" is a disease or disorder for which the physical etiology is contributed to directly or indirectly by psychological factors. As used herein a "psychoimmunologic disorder" is an immunologic disease or disorder wherein an immunological response is influenced directly or indirectly by psychological factors.

Although the present invention is useful in any mammal suffering from psychosomatic disorder or a psychoimmunologic disorders, a preferred subject is a human.

The tachykinin receptor antagonists of use in the present invention may be any tachykinin antagonist known from the art. Preferably, the tachykinin receptor antagonist is a neurokinin-1 (NK-1) or neurokinin-2 (NK-2) receptor antagonist, especially a neurokinin-1 (NK-1) receptor antagonist.

The tachykinin antagonist may be peptidal or non-peptidal in nature, however, the use of a non-peptidal tachykinin receptor antagonist is preferred. In addition, for convenience the use of an orally active tachykinin receptor antagonist is preferred.

In the present invention, it is preferred that the tachykinin receptor antagonist is active upon the central nervous system (CNS), such as the brain, following systemic administration, i.e. that it readily penetrates the CNS. Accordingly, a preferred tachykinin antagonist for use in the present invention is a CNS-penetrating tachykinin antagonist, especially a CNS-penetrating NK-1 antagonist. An especially preferred class of NK-1 receptor antagonist of use in the present invention are those compounds which are orally active, long acting and CNS-penetrant.

Neurokinin-1 receptor antagonists of use in the present invention are fully described, for example, in U.S. Pat. Nos. 5,162,339, 5,232,929, 5,242,930, 5,373,003, 5,387,595, 5,459,270, 5,494,926, 5,496,833, 5,637,699; European Patent Publication Nos. EP 0 360 390, 0 394 989, 0 428 434, 0 429 366, 0 430 771, 0 436 334, 0 443 132, 0 482 539, 0 498 069, 0 499 313, 0 512 901, 0 512 902, 0 514 273, 0 514 274, 0 514 275, 0 514 276, 0 515 681, 0 517 589, 0 520 555, 0 522 808, 0 528 495, 0 532 456, 0 533 280, 0 536 817, 0 545 478, 0 558 156, 0 577 394, 0 585 913,0 590 152, 0 599 538, 0 610 793, 0 634 402, 0 686 629, 0 693 489, 0 694 535, 0 699 655, 0 699 674, 0 707 006, 0 708 101, 0 709 375, 0 709 376, 0 714 891, 0 723 959, 0 733 632 and 0 776 893; PCT International Patent Publication Nos. WO 90/05525, 90/05729, 91/09844, 91/18899, 92/01688, 92/06079, 92/12151, 92/15585, 92/17449, 92/20661, 92/20676, 92/21677, 92/22569, 93/00330, 93/00331, 93/01159, 93/01165, 93/01169, 93/01170, 93/06099, 93/09116, 93/10073, 93/14084, 93/14113, 93/18023, 93/19064, 93/21155, 93/21181, 93/23380, 93/24465, 94/00440, 94/01402, 94/02461, 94/02595, 94/03429, 94/03445, 94/04494, 94/04496, 94/05625, 94/07843, 94/08997, 94/10165, 94/10167, 94/10168, 94/10170, 94/11368, 94/13639, 94/13663, 94/14767, 94/15903, 94/19320, 94/19323, 94/20500, 94/26735, 94/26740, 94/29309, 95/02595, 95/04040, 95/04042,95/06645, 95/07886, 95/07908, 95/08549, 95/11880, 95/14017, 95/15311, 95/16679, 95/17382, 95/18124, 95/18129, 95119344, 95/20575, 95/21819, 95/22525, 95/23798, 95/26338, 95/28418, 95/30674, 95/30687, 95/33744, 96/05181, 96/05193, 96/05203, 96/06094, 96/07649, 96/10562, 96/16939, 96/18643, 96120197, 96/21661, 96/29304, 96/29317, 96/29326, 96/29328, 96/31214, 96/32385, 96/37489, 97/01553, 97/01554, 97/03066, 97/08144, 97/14671, 97/17362, 97/18206, 97/19084, 97/19942 and 97/21702; and in British Patent Publication Nos. 2 266 529, 2 268 931, 2 269 170, 2 269 590, 2 271 774, 2 292 144, 2 293 168, 2 293 169, and 2 302 689. The preparation of such compounds is fully described in the aforementioned patents and publications.

Particularly preferred NK-1 receptor antagonists are those described in PCT International Patent Publication No. WO 95/16679 and European Patent Publication No. 0 577 394 as compounds of formula (I): ##STR1## or a pharmaceutically acceptable salt thereof, wherein:

R¹ is selected from the group consisting of:

(1) hydrogen;

(2) C₁₋₆ alkyl, unsubstituted or substituted with one or more of the substituents selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo, wherein halo is fluoro, chloro, bromo or iodo,

(h) --NR⁹ R¹⁰, wherein R⁹ and R¹⁰ are independently selected from:

(i) hydrogen,

(ii) C₁₋₆ alkyl,

(iii) hydroxy-C₁₋₆ alkyl, and

(iv) phenyl,

(i) --NR⁹ COR¹⁰,

(j) --NR⁹ CO₂ R¹⁰,

(k) --CONR⁹ R¹⁰,

(l) --COR⁹,

(m) --CO₂ R⁹,

(n) heterocycle, wherein the heterocycle is selected from the group consisting of:

(A) benzimidazolyl,

(B) benzofuranyl,

(C) benzothiophenyl,

(D) benzoxazolyl,

(E) furanyl,

(F) imidazolyl,

(G) indolyl,

(H) isooxazolyl,

(I) isothiazolyl,

(J) oxadiazolyl,

(K) oxazolyl,

(L) pyrazinyl,

(M) pyrazolyl,

(N) pyridyl,

(O) pyrimidyl,

(P) pyrrolyl,

(Q) quinolyl,

(R) tetrazolyl,

(S) thiadiazolyl,

(T) thiazolyl,

(U) thienyl,

(V) triazolyl,

(W) azetidinyl,

(X) 1,4-dioxanyl,

(Y) hexahydroazepinyl,

(Z) piperazinyl,

(AA) piperidinyl,

(AB) pyrrolidinyl,

(AC) tetrahydrofuranyl, and

(AD) tetrahydrothienyl,

and wherein the heterocycle is unsubstituted or substituted with one or more substituent(s) selected from:

(i) C₁₋₆ alkyl, unsubstituted or substituted with halo, --CF₃, --OCH₃, or phenyl,

(ii) C₁₋₆ alkoxy,

(iii) oxo,

(iv) hydroxy,

(v) thioxo,

(vi) --SR⁹,

(vii) halo,

(viii) cyano,

(ix) phenyl,

(x) trifluoromethyl,

(xi) --(CH₂)_(m) --NR⁹ R¹⁰, wherein m is 0, 1 or 2,

(xii) --NR⁹ COR¹⁰,

(xiii) --CONR⁹ R¹⁰,

(xiv) --CO₂ R⁹, and

(xv) --(CH₂)_(m) --OR⁹ ;

(3) C₂₋₆ alkenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --CONR⁹ R¹⁰,

(i) --COR⁹,

(j) --CO₂ R⁹,

(k) heterocycle;

(4) C₂₋₆ alkynyl;

(5) phenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) C₁₋₆ alkoxy,

(c) C₁₋₆ alkyl,

(d) C₂₋₅ alkenyl,

(e) halo,

(f) --CN,

(g) --NO₂,

(h) --CF₃,

(i) --(CH₂)_(m) --NR⁹ R¹⁰,

(j) --NR⁹ COR¹⁰,

(k) --NR⁹ CO₂ R¹⁰,

(l) --CONR⁹ R¹⁰,

(m) --CO₂ NR⁹ R¹⁰,

(n) --COR⁹,

(o) --CO₂ R⁹ ;

R² and R³ are independently selected from the group consisting of:

(1) hydrogen,

(2) C₁₋₆ alkyl, unsubstituted or substituted with one or more of the substituents selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --NR⁹ R¹⁰,

(i) --NR⁹ COR¹⁰,

(j) --NR⁹ CO₂ R¹⁰,

(k) --CONR⁹ R¹⁰,

(l) --COR⁹, and

(m) --CO₂ R⁹ ;

(3) C₂₋₆ alkenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --CONR⁹ R¹⁰,

(i) --COR⁹, and

(j) --CO₂ R⁹ ;

(4) C₂₋₆ alkynyl;

(5) phenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) C₁₋₆ alkoxy,

(c) C₁₋₆ alkyl,

(d) C₂₋₅ alkenyl,

(e) halo,

(f) --CN,

(g) --NO₂,

(h) --CF₃,

(i) --(CH₂)_(m) --NR⁹ R¹⁰,

(j) --NR⁹ COR¹⁰,

(k) --NR⁹ CO₂ R¹⁰,

(l) --CONR⁹ R¹⁰,

(m) --CO₂ NR⁹ R¹⁰,

(n) --COR⁹, and

(o) --CO₂ R⁹ ;

and the groups R¹ and R² may be joined together to form a heterocyclic ring selected from the group consisting of:

(a) pyrrolidinyl,

(b) piperidinyl,

(c) pyrrolyl,

(d) pyridinyl,

(e) imidazolyl,

(f) oxazolyl, and

(g) thiazolyl,

and wherein the heterocyclic ring is unsubstituted or substituted with one or more substituent(s) selected from:

(i) C₁₋₆ alkyl,

(ii) oxo,

(iii) C₁₋₆ alkoxy,

(iv) --NR⁹ R¹⁰,

(v) halo, and

(vi) trifluoromethyl;

and the groups R² and R³ may be joined together to form a carbocyclic ring selected from the group consisting of:

(a) cyclopentyl,

(b) cyclohexyl,

(c) phenyl,

and wherein the carbocyclic ring is unsubstituted or substituted with one or more substituents selected from:

(i) C₁₋₆ alkyl,

(ii) C₁₋₆ alkoxy,

(iii) --NR⁹ R¹⁰,

(iv) halo, and

(v) trifluoromethyl;

and the groups R² and R³ may be joined together to form a heterocyclic ring selected from the group consisting of:

(a) pyrrolidinyl,

(b) piperidinyl,

(c) pyrrolyl,

(d) pyridinyl,

(e) imidazolyl,

(f) furanyl,

(g) oxazolyl,

(h) thienyl, and

(i) thiazolyl,

and wherein the heterocyclic ring is unsubstituted or substituted with one or more substituent(s) selected from:

(i) C₁₋₆ alkyl,

(ii) oxo,

(iii) C₁₋₆ alkoxy,

(iv) --NR⁹ R¹⁰,

(v) halo, and

(vi) trifluoromethyl;

R⁶, R⁷ and R⁸ are independently selected from the group consisting of:

(1) hydrogen;

(2) C₁₋₆ alkyl, unsubstituted or substituted with one or more of the substituents selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --NR⁹ R¹⁰,

(i) --NR⁹ COR¹⁰,

(j) --NR⁹ CO₂ R¹⁰,

(k) --CONR⁹ R¹⁰,

(l) --COR⁹, and

(m) --CO₂ R⁹ ;

(3) C₂₋₆ alkenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --CONR⁹ R¹⁰,

(i) --COR⁹, and

(j) --CO₂ R⁹ ;

(4) C₂₋₆ alkynyl;

(5) phenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) C₁₋₆ alkoxy,

(c) C₁₋₆ alkyl,

(d) C₂₋₅ alkenyl,

(e) halo,

(f) --CN,

(g) --NO₂,

(h) --CF₃,

(i) --(CH₂)_(m) --NR⁹ R¹⁰,

(j) --NR⁹ COR¹⁰,

(k) --NR⁹ CO₂ R¹⁰,

(l) --CONR⁹ R¹⁰,

(m) --CO₂ NR⁹ R¹⁰,

(n) --COR⁹,

(o) --CO₂ R⁹ ;

(6) halo,

(7) --CN,

(8) --CF₃,

(9) --NO₂,

(10) --SR¹⁴, wherein R¹⁴ is hydrogen or C₁₋₅ alkyl,

(11) --SOR¹⁴,

(12) --SO₂ R¹⁴,

(13) NR⁹ COR¹⁰,

(14) CONR⁹ COR¹⁰,

(15) NR⁹ R¹⁰,

(16) NR⁹ CO₂ R¹⁰,

(17) hydroxy,

(18) C₁₋₆ alkoxy,

(19) COR⁹,

(20) CO₂ R⁹,

(21) 2-pyridyl,

(22) 3-pyridyl,

(23) 4-pyridyl,

(24) 5-tetrazolyl,

(25) 2-oxazolyl, and

(26) 2-thiazolyl;

R¹¹, R¹² and R¹³ are independently selected from the definitions of R⁶, R⁷ and R⁸ ;

X is selected from the group consisting of:

(1) --O--,

(2) --S--,

(3) --SO--, and

(4) --SO₂ --;

Y is selected from the group consisting of:

(1) a single bond,

(2) --O--,

(3) --S--,

(4) --CO--,

(5) --CH₂ --,

(6) --CHR¹⁵ --, and

(7) -CR¹⁵ R¹⁶ --, wherein R¹⁵ and R¹⁶ are independently selected from the group consisting of:

(a) C₁₋₆ alkyl, unsubstituted or substituted with one or more of the substituents selected from:

(i) hydroxy,

(ii) oxo,

(iii) C₁₋₆ alkoxy,

(iv) phenyl-C₁₋₃ alkoxy,

(v) phenyl,

(vi) --CN,

(vii) halo,

(viii) --NR⁹ R¹⁰,

(ix) --NR⁹ COR¹⁰,

(x) --NR⁹ CO₂ R¹⁰,

(xi) --CONR⁹ R¹⁰,

(xii) --COR⁹, and

(xiii) --CO₂ R⁹ ;

(b) phenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(i) hydroxy,

(ii) C₁₋₆ alkoxy,

(iii) C₁₋₆ alkyl,

(iv) C₂₋₅ alkenyl,

(v) halo,

(vi) --CN,

(vii) --NO₂,

(viii) --CF₃,

(ix) --(CH₂)_(m) --NR⁹ R¹⁰,

(x) --NR⁹ COR¹⁰,

(xi) --NR⁹ CO₂ R¹⁰,

(xii) --CONR⁹ R¹⁰,

(xiii) --CO₂ NR⁹ R¹⁰,

(xiv) --COR⁹, and

(xv) --CO₂ R⁹ ; and

Z is C₁₋₆ alkyl.

Particularly preferred compounds of formula (I) include:

4-(3-(1,2,4-triazolo)methyl)-2(S)-(3,5-bis(trifluoromethyl)benzyloxy)-3(S)-phenyl-morpholine;

4-(3-(1,2,4-triazolo)methyl)-2(S)-(3,5-bis(trifluoromethyl)benzyloxy)-3(R)-phenyl-morpholine;

4-(3-(5-oxo-1H,4H-1,2,4-triazolo)methyl)-2(S)-(3,5-bis(trifluoromethyl)benzyloxy)-3(S)-phenyl-morpholine; and

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(5-oxo-1H,4H-1,2,4-triazolo)methyl)morpholine; or a pharmaceutically acceptable salt thereof.

An especially preferred compound of formula (I) is

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(5-oxo-1H,4H-1,2,4-triazolo)methylmorpholine; or a pharmaceutically acceptable salt thereof.

Further preferred NK-1 receptor antagonists are those described in PCT International Patent Publication No. WO 95/18124 as compounds of formula (II): ##STR2## or a pharmaceutically acceptable salt or prodrug thereof, wherein

R¹ is hydrogen, halogen, C₁₋₆ alkyl, C₁₋₆ alkoxy, CF₃, NO₂, CN, SR^(a), SOR^(a), SO₂ R^(a), CO₂ R^(a), CONR^(a) R^(b), C₂₋₆ alkenyl, C₂₋₆ alkynyl or C₁₋₄ alkyl substituted by C₁₋₄ alkoxy, where R^(a) and R^(b) each independently represent hydrogen or C₁₋₄ alkyl;

R² is hydrogen, halogen, C₁₋₆ alkyl, C₁₋₆ alkoxy substituted by C₁₋₄ alkoxy or CF₃ ;

R³ is hydrogen, halogen or CF₃ ;

R⁴ is hydrogen, halogen, C₁₋₆ alkyl, C₁₋₆ alkoxy, CF₃, NO₂, CN, SR^(a), SOR^(a), SO₂ R^(a), CO₂ R^(a), CONR^(a) R^(b), C₂₋₆ alkenyl, C₂₋₆ alkynyl or C₁₋₄ alkyl substituted by C₁₋₄ alkoxy, where R^(a) and R^(b) each independently represent hydrogen or C₁₋₄ alkyl;

R⁵ is hydrogen, halogen, C₁₋₆ alkyl, C₁₋₆ alkoxy substituted by C₁₋₄ alkoxy or CF₃ ;

R⁶ is a 5-membered or 6-membered heterocyclic ring containing 2 or 3 nitrogen atoms optionally substituted by ═O, ═S or a C₁₋₄ alkyl group, and optionally substituted by a group of the formula ZNR⁷ R⁸ where

Z is C₁₋₆ alkylene or C₃₋₆ cycloalkylene;

R⁷ is hydrogen, C₁₋₄ alkyl, C₃₋₇ cycloalkyl or C₃₋₇ cycloalkylC₁₋₄ alkyl, or C₂₋₄ alkyl substituted by C₁₋₄ alkoxy or hydroxyl;

R⁸ is hydrogen, C₁₋₄ alkyl, C₃₋₇ cycloalkyl or C₃₋₇ cycloalkylC₁₋₄ alkyl, or C₂₋₄ alkyl substituted by one or two substituents selected from C₁₋₄ alkoxy, hydroxyl or a 4, 5 or 6 membered heteroaliphatic ring containing one or two heteroatoms selected from N, O and S;

or R⁷, R⁸ and the nitrogen atom to which they are attached form a heteroaliphatic ring of 4 to 7 ring atoms, optionally substituted by a hydroxy group, and optionally containing a double bond, which ring may optionally contain an oxygen or sulphur ring atom, a group S(O) or S(O)₂ or a second nitrogen atom which will be part of a NH or NR^(c) moiety where R^(c) is C₁₋₄ alkyl optionally substituted by hydroxy or C₁₋₄ alkoxy;

or R⁷, R⁸ and the nitrogen atom to which they are attached form a non-aromatic azabicyclic ring system of 6 to 12 ring atoms; or Z, R⁷ and the nitrogen atom to which they are attached form a heteroaliphatic ring of 4 to 7 ring atoms which may optionally contain an oxygen ring atom;

R^(9a) and R^(9b) are each independently hydrogen or C₁₋₄ alkyl, or R^(9a) and R^(9b) are joined so, together with the carbon atoms to which they are attached, there is formed a C₅₋₇ ring;

X is an alkylene chain of 1 to 4 carbon atoms optionally substituted by oxo; and

Y is a C₁₋₄ alkyl group optionally substituted by a hydroxyl group; with the proviso that if Y is C₁₋₄ alkyl, R⁶ is substituted at least by a group of formula ZNR⁷ R⁸ as defined above.

Particularly preferred compounds of formula (II) include:

2-(R)-2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(5-(dimethylamino) methyl-1,2,3-triazol-4-yl)methyl-3-(S)-phenylmorpholine;

(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-((dimethylamino-methyl)-1,2,3-triazol-4-yl)methyl)-3-(S)-(4-fluorophenyl)morpholine; or a pharmaceutically acceptable salt thereof.

Further preferred NK-1 receptor antagonists are those described in U.S. Pat. No. 5,691,336 and PCT International Patent Publication No. WO 95/23798 as compounds of formula (II): ##STR3## or a pharmaceutically acceptable salt thereof, wherein:

R² and R³ are independently selected from the group consisting of:

(1) hydrogen,

(2) C₁₋₆ alkyl, unsubstituted or substituted with one or more of the substituents selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --NR⁹ R¹⁰, wherein R⁹ and R¹⁰ are independently selected from:

(i) hydrogen,

(ii) C₁₋₆ alkyl,

(iii) hydroxy-C₁₋₆ alkyl, and

(iv) phenyl,

(i) --NR⁹ COR¹⁰,

(j) NR⁹ CO₂ R¹⁰,

(k) --CONR⁹ R¹⁰,

(l) --COR⁹, and

(m) --CO₂ R⁹ ;

(3) C₂₋₆ alkenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --CONR⁹ R¹⁰,

(i) --COR⁹, and

(j) --CO₂ R⁹ ;

(4) C₂₋₆ alkynyl;

(5) phenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) C₁₋₆ alkoxy,

(c) C₁₋₆ alkyl,

(d) C₂₋₅ alkenyl,

(e) halo,

(f) --CN,

(g) --NO₂,

(h) --CF₃,

(i) --(CH₂)_(m) --NR⁹ R¹⁰,

(j) --NR⁹ COR¹⁰,

(k) --NR⁹ CO₂ R¹⁰,

(l) --CONR⁹ R¹⁰,

(m) --CO₂ NR⁹ R¹⁰,

(n) --COR⁹, and

(o) --CO₂ R⁹ ;

and, alternatively, the groups R² and R³ are joined together to form a carbocyclic ring selected from the group consisting of:

(a) cyclopentyl,

(b) cyclohexyl,

(c) phenyl,

and wherein the carbocyclic ring is unsubstituted or substituted with one or more substituents selected from:

(i) C₁₋₆ alkyl,

(ii) C₁₋₆ alkoxy,

(iii) --NR⁹ R¹⁰,

(iv) halo, and

v) trifluoromethyl;

and, alternatively, the groups R² and R³ are joined together to form a heterocyclic ring selected from the group consisting of:

(a) pyrrolidinyl,

(b) piperidinyl,

(c) pyrrolyl,

(d) pyridinyl,

(e) imidazolyl,

(f) furanyl,

(g) oxazolyl,

(h) thienyl, and

(i) thiazolyl,

and wherein the heterocyclic ring is unsubstituted or substituted with one or more substituent(s) selected from:

(i) C₁₋₆ alkyl,

(ii) oxo,

(iii) C₁₋₆ alkoxy,

(iv) --NR⁹ R¹⁰,

(v) halo, and

(vi) trifluoromethyl;

R⁶, R⁷ and R⁸ are independently selected from the group consisting of:

(1) hydrogen;

(2) C₁₋₆ alkyl, unsubstituted or substituted with one or more of the substituents selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --NR⁹ R¹⁰,

(i) --NR⁹ COR¹⁰,

(j) --NR⁹ CO₂ R¹⁰,

(k) --CONR⁹ R¹⁰,

(l) --COR⁹, and

(m) --CO₂ R⁹ ;

(3) C₂₋₆ alkenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --CONR⁹ R¹⁰,

(i) --COR⁹, and

(j) --CO₂ R⁹ ;

(4) C₂₋₆ alkynyl;

(5) phenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) C₁₋₆ alkoxy,

(c) C₁₋₆ alkyl,

(d) C₂₋₅ alkenyl,

(e) halo,

(f) --CN,

(g) --NO₂,

(h) --CF₃,

(i) --(CH₂)_(m) --NR⁹ R¹⁰,

(j) --NR⁹ COR¹⁰,

(k) --NR⁹ CO₂ R¹⁰,

(l) --CONR⁹ R¹⁰,

(m) --CO₂ NR⁹ R¹⁰,

(n) --COR⁹, and

(o) --CO₂ R⁹ ;

(6) halo,

(7) --CN,

(8) --CF₃,

(9) --NO₂,

(10) --SR¹⁴, wherein R¹⁴ is hydrogen or C₁₋₅ alkyl,

(11) --SOR¹⁴,

(12) --SO₂ R¹⁴,

(13) NR⁹ COR¹⁰,

(14) CONR⁹ COR¹⁰,

(15) NR⁹ R¹⁰,

(16) NR⁹ CO₂ R¹⁰,

(17) hydroxy,

(18) C₁₋₆ alkoxy,

(19) COR⁹,

(20) CO₂ R⁹,

(21) 2-pyridyl,

(22) 3-pyridyl,

(23) 4-pyridyl,

(24) 5-tetrazolyl,

(25) 2-oxazolyl, and

(26) 2-thiazolyl;

R¹¹, R¹² and R¹³ are independently selected from the definitions of R⁶, R⁷ and R⁸, or --OX;

A is selected from the group consisting of:

(1) C₁₋₆ alkyl, unsubstituted or substituted with one or more of the substituents selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --NR⁹ R¹⁰,

(i) --NR⁹ COR¹⁰,

(j) --NR⁹ CO₂ R¹⁰,

(k) --CONR⁹ R¹⁰,

(l) --COR⁹, and

(m) --CO₂ R⁹ ;

(2) C₂₋₆ alkenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(a) hydroxy,

(b) oxo,

(c) C₁₋₆ alkoxy,

(d) phenyl-C₁₋₃ alkoxy,

(e) phenyl,

(f) --CN,

(g) halo,

(h) --CONR⁹ R¹⁰,

(i) --COR⁹, and

(j) --CO₂ R⁹ ; and

(3) C₂₋₆ alkynyl;

B is a heterocycle, wherein the heterocycle is selected from the group consisting of: ##STR4## and wherein the heterocycle is substituted in addition to --X with one or more substituent(s) selected from:

(i) hydrogen;

(ii) C₁₋₆ alkyl, unsubstituted or substituted with halo, --CF₃, --OCH₃, or phenyl,

(iii) C₁₋₆ alkoxy,

(iv) oxo,

(v) hydroxy,

(vi) thioxo,

(vii) --SR⁹,

(viii) halo,

(ix) cyano,

(x) phenyl,

(xi) trifluoromethyl,

(xii) --(CH₂)_(m) --NR⁹ R¹⁰, wherein m is 0, 1 or 2,

(xiii) --NR⁹ COR¹⁰,

(xiv) --CONR⁹ R¹⁰,

(xv) --CO₂ R⁹, and

(xvi) --(CH₂)_(m) --OR⁹ ;

p is 0 or 1;

X is selected from:

(a) --PO(OH)O⁻.M⁺, wherein M⁺ is a pharmaceutically acceptable monovalent counterion,

(b) --PO(O⁻)₂.2M⁺,

(c) --PO(O⁻)2.D²⁺, wherein D²⁺ is a pharmaceutically acceptable divalent counterion,

(d) --CH(R⁴)--PO(OH)O⁻.M⁺, wherein R⁴ is hydrogen or C₁₋₃ alkyl,

(e) --CH(R⁴)--PO(O⁻)₂.2M⁺,

(f) --CH(R⁴)--PO(O⁻)₂.D²⁺,

(g) --SO₃.spsb.-.M⁺,

(h) --CH(R⁴)--SO₃.spsb.-.M⁺,

(i) --CO--CH₂ CH₂ --CO₂.spsb.-.M⁺,

(j) --CH(CH₃)--O--CO--R⁵, wherein R⁵ is selected from the group consisting of: ##STR5## (k) hydrogen, with the proviso that if p is 0 and none of R¹¹, R¹² or R¹³ are --OX, then X is other than hydrogen;

Y is selected from the group consisting of:

(1) a single bond,

(2) --O--,

(3) --S--,

(4) --CO--,

(5) --CH₂ --,

(6) --CHR¹⁵ --, and

(7) --CR¹⁵ R¹⁶ --, wherein R¹⁵ and R¹⁶ are independently selected from the group consisting of:

(a) C₁₋₆ alkyl, unsubstituted or substituted with one or more of the substituents selected from:

(i) hydroxy,

(ii) oxo,

(iii) C₁₋₆ alkoxy,

(iv) phenyl-C₁₋₃ alkoxy,

(v) phenyl,

(vi) --CN,

(vii) halo,

(viii) --NR⁹ R¹⁰,

(ix) --NR⁹ COR¹⁰,

(x) --NR⁹ CO₂ R¹⁰,

(xi) --CONR⁹ R¹⁰,

(xii) --COR⁹, and

(xiii) --CO₂ R⁹ ;

(b) phenyl, unsubstituted or substituted with one or more of the substituent(s) selected from:

(i) hydroxy,

(ii) C₁₋₆ alkoxy,

(iii) C₁₋₆ alkyl,

(iv) C₂₋₅ alkenyl,

(v) halo,

(vi) --CN,

(vii) --NO₂,

(viii) --CF₃,

(ix) --(CH₂)_(m) --NR⁹ R¹⁰,

(x) --NR⁹ COR¹⁰,

(xi) --NR⁹ CO₂ R¹⁰,

(xii) --CONR⁹ R¹⁰,

(xii) --CO₂ NR⁹ R¹⁰,

(xiv) --COR⁹, and

(xv) --CO₂ R⁹ ;

Z is selected from:

(1) hydrogen,

(2) C₁₋₆ alkyl, and

(3) hydroxy, with the proviso that if Y is --O--, Z is other than hydroxy, or if Y is --CHR¹⁵ --, then Z and R¹⁵ are optionally joined together to form a double bond.

A particularly preferred compound of formula (III) is 2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluoro)-phenyl-4-(3-(1-monophosphoryl-5-oxo-1H-1,2,4-triazolo)methyl)morpholine, or a pharmaceutically acceptable salt thereof. In particular, the bis(N-methyl-D-glucamine) salt is preferred.

Further preferred NK-1 receptor antagonists are those described in European Patent Specification No. WO 96/05181, i.e. compounds of formula (IV): ##STR6## wherein:

X is a group of the formula NR⁶ R⁷ or a C- or N-linked imidazolyl ring;

Y is hydrogen or C₁₋₄ alkyl optionally substituted by a hydroxy group;

R¹ is hydrogen, halogen, C₁₋₆ alkyl, C₁₋₆ alkoxy, CF₃, NO₂, CN, SR^(a), SOR^(a), SO₂ R^(a), CO₂ R^(a), CONR^(a) R^(b), C₂₋₆ alkenyl, C₂₋₆ alkynyl or C₁₋₄ alkyl substituted by C₁₋₄ alkoxy, wherein R^(a) and R^(b) each independently represent hydrogen or C₁₋₄ alkyl;

R² is hydrogen, halogen, C₁₋₆ alkyl, C₁₋₆ alkoxy substituted by C₁₋₄ alkoxy or CF₃ ;

R³ is hydrogen, halogen or CF₃ ;

R⁴ is hydrogen, halogen, C₁₋₆ alkyl, C₁₋₆ alkoxy, hydroxy, CF₃, NO₂, CN, SR^(a), SOR^(a), SO₂ R^(a), CO₂ R^(a), CONR^(a) R^(b), C₂₋₆ alkenyl, C₂₋₆ alkynyl or C₁₋₄ alkyl substituted by C₁₋₄ alkoxy, wherein R^(a) and R^(b) are as previously defined;

R⁵ is hydrogen, halogen, C₁₋₆ alkyl, C₁₋₆ alkoxy substituted by C₁₋₄ alkoxy or CF₃ ;

R⁶ is hydrogen, C₁₋₆ alkyl C₃₋₇ cycloalkyl, C₃₋₇ cycloalkylC₁₋₄ alkyl, phenyl, or C₂₋₄ alkyl substituted by C₁₋₄ alkoxy or hydroxy;

R⁷ is hydrogen, C₁₋₆ alkyl, C₃₋₇ cycloalkyl, C₃₋₇ cycloalkylC₁₋₄ alkyl, phenyl, or C₂₋₄ alkyl substituted by one or two substituents selected from C₁₋₄ alkoxy, hydroxy or a 4, 5 or 6 membered heteroaliphatic ring containing one or two heteroatoms selected from N, O and S;

or R⁶ and R⁷, together with the nitrogen atom to which they are attached, form a saturated or partially saturated heterocyclic ring of 4 to 7 ring atoms, which ring may optionally contain in the ring one oxygen or sulphur atom or a group selected from NR⁸, S(O) or S(O)₂ and which ring may be optionally substituted by one or two groups selected from hydroxyC₁₋₄ alkyl, C₁₋₄ alkoxyC₁₋₄ alkyl, oxo, COR^(a) or CO₂ R^(a) where R^(a) is as previously defined;

or R⁶ and R⁷ together with the nitrogen atom to which they are attached, form a non-aromatic azabicyclic ring system of 6 to 12 ring atoms;

R⁸ is hydrogen, C₁₋₄ alkyl, hydroxyC₁₋₄ alkyl or C₁₋₄ alkoxyC₁₋₄ alkyl; and

R^(9a) and R^(9b) are each independently hydrogen or C₁₋₄ alkyl, or R^(9a) and R^(9b) are joined so, together with the carbon atoms to which they are attached, there is formed a C₅₋₇ ring; and pharmaceutically acceptable salts thereof.

Specific compounds of formula (IV) of use in the present invention include:

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(4-morpholinobut-2-yn-yl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(4-N,N-dimethylaminobut-2-yn-yl)-3-(S)-(4-fluorophenyl)morpholine;

4-(4-azetidinylbut-2-yn-yl)-2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl) ethoxy)-3-(S)-(4-fluorophenyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(4-imidazolylbut-2-yn-yl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(4-(N-methylpiperazinyl)but-2-yn-yl)morpholine;

4-(4-bis(2-methoxyethyl)aminobut-2-yn-yl)-2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(4-pyrrolidinobut-2-yn-yl)morpholine;

3-(S)-(4-fluorophenyl)-2-(R)-(1-(R)-(3-fluoro-5-(trifluoromethyl)phenyl) ethoxy)-4-(4-morpholinobut-2-yn-yl)morpholine;

3-(S)-(4-fluorophenyl)-4-(4-morpholinobut-2-yn-yl)-2-(R)-(1-(R)-(3-(trifluoromethyl)phenyl)ethoxy)morpholine;

4-(4-azetidinylbut-2-yn-yl)-3-(S)-(4-fluorophenyl)-2-(R)-(1-(R)-(3-(trifluoromethyl)phenyl)ethoxy)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(4-(N-(2-methoxyethyl)-N-methyl)aminobut-2-yn-yl)-3-(S)-phenylmorpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(4-(N-cyclopropyl-N-(2-methoxyethyl)amino)but-2-yn-yl)-3-(S)-phenylmorpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(4-(N-isopropyl-N-(2-methoxyethyl)amino)but-2-yn-yl)-3-(S)-phenylmorpholine;

4-(4-(N,N-dimethylamino)but-2-yn-yl)-3-(S)-(4-fluorophenyl)-2-(R)-(1-(S)-(3-fluoro-5-(trifluoromethyl)phenyl-2-hydroxyethoxy)morpholine;

4-(4-azetidinylbut-2yn-yl)-3-(S)-(4-fluorophenyl)-2-(R)-(1-(S)-(3-fluoro-5-(trifluoromethyl)phenyl)-2-hydroxyethoxy)morpholine;

2-(R)-(1-(S)-(3,5-bis(trifluoromethyl)phenyl)-2-hydroxyethoxy)-4-(4-(N,N-dimethylamino)but-2-yn-yl)-3-(S)-(4-fluorophenyl)morpholine;

4-(4-azetidinylbut-2-yn-yl)-2-(R)-(1-(S)-(3,5-bis(trifluoromethyl)phenyl-2-hydroxyethoxy)-3-(S)-(4-fluorophenyl)morpholine;

4-(4-N-bis(2-methoxy)ethyl-N-methylamino)but-2-yn-yl)-2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(4-(2-(S)-(methoxymethyl)pyrrolidino)but-2-yn-yl)morpholine;

4-(4-(7-azabicyclo[2.2.1]heptano)but-2-yn-yl)-2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(4-diisopropylaminobut-2-yn-yl)-3-(S)-(4-fluorophenyl)morpholine;

2-(R)-(1-(R)-(3-fluoro-5-(trifluoromethyl)phenyl)ethoxy)-4-(4-(2-(S)-(methoxymethyl)pyrrolidino)but-2-yn-yl)-3-(S)-phenylmorpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(4-(2-(S)-(hydroxymethyl)pyrrolidino)but-2-yn-yl)morpholine;

and pharmaceutically acceptable salts thereof.

Further preferred NK-1 receptor antagonists are those described in European Patent Publication No. 0 436 334 as compounds of formula (V): ##STR7## or a pharmaceutically acceptable salt thereof, wherein

Y is (CH₂)_(n) wherein n is an integer from 1 to 4, and wherein any one of the carbon-carbon single bonds in said (CH₂)_(n) may optionally be replaced by a carbon-carbon double bond, and wherein any one of the carbon atoms of said (CH₂)_(n) may optionally be substituted with R⁴, and wherein any one of the carbon atoms of said (CH₂)_(n) may optionally be substituted with R⁷ ;

Z is (CH₂)_(m) wherein m is an integer from 0 to 6, and wherein any one of the carbon-carbon single bonds of (CH₂)_(m) may optionally be replaced by a carbon-carbon double bond or a carbon-carbon triple bond, and any one of the carbon atoms of said (CH₂)_(m) may optionally be substituted with R⁸ ;

R¹ is hydrogen or C₁₋₈ alkyl optionally substituted with hydroxy, C₁₋₄ alkoxy or fluoro;

R² is a radical selected from hydrogen, C₁₋₆ straight or branched alkyl, C₃₋₇ cycloalkyl wherein one of the CH2 groups in said cycloalkyl may optionally be replaced by NH, oxygen or sulphur; aryl selected from phenyl and naphthyl; heteroaryl selected from indanyl, thienyl, furyl, pyridyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, triazolyl, tetrazolyl and quinolyl; phenyl-C₂₋₆ alkyl, benzhydryl and benzyl, wherein each of said aryl and heteroaryl groups and the phenyl moieties of said benzyl, phenyl-C₂₋₆ alkyl and benzhydryl may optionally be substituted with one or more substituents independently selected from halo, nitro, C₁₋₆ alkyl, C₁₋₆ alkoxy, trifluoromethyl, amino, C₁₋₆ alkylamino, C₁₋₆ alkyl-O--CO, C₁₋₆ alkyl-O--CO--C₁₋₆ alkyl, C₁₋₆ alkyl--CO--O, C₁₋₆ alkyl--CO--C₁₋₆ alkyl-O--, C₁₋₆ alkyl--CO, C₁₋₆ alkyl--CO--C₁₋₆ alkyl-, di-C₁₋₆ alkylamino, --CONH-C₁₋₆ alkyl, C₁₋₆ alkyl--CO--NH--C₁₋₆ alkyl, --NHCOH and --NHCO--C₁₋₆ alkyl; and wherein one of the phenyl moieties of said benzhydryl may optionally be replaced by naphthyl, thienyl, furyl or pyridyl;

R⁵ is hydrogen, phenyl or C₁₋₆ alkyl;

or R² and R⁵ together with the carbon to which they are attached, form a saturated ring having from 3 to 7 carbon atoms wherein one of the CH₂ groups in said ring may optionally be replaced by oxygen, NH or sulfur;

R³ is aryl selected from phenyl and naphthyl; heteroaryl selected from indanyl, thienyl, furyl, pyridyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, triazolyl, tetrazolyl and quinolyl; and cycloalkyl having 3 to 7 carbon atoms wherein one of the (CH₂) groups in said cycloalkyl may optionally be replaced by NH, oxygen or sulphur;

wherein each of said aryl and heteroaryl groups may optionally be substituted with one or more substituents, and said C₃₋₇ cycloalkyl may optionally be substituted with one or two substituents, each of said substituents being independently selected from halo, nitro, C₁₋₆ alkyl, C₁₋₆ alkoxy, trifluoromethyl, amino, C₁₋₆ alkylamino, --CO--NH--C₁₋₆ alkyl, C₁₋₆ alkyl--CO--NH--C₁₋₆ alkyl, --NHCOH and --NH CO--C₁₋₆ alkyl;

R⁴ and R⁷ are each independently selected from hydroxy, halogen, halo, amino, oxo, cyano, methylene, hydroxymethyl, halomethyl, C₁₋₆ alkylamino, di-C₁₋₆ alkylamino, C₁₋₆ alkoxy, C₁₋₆ alkyl-O--CO, C₁₋₆ alkyl-O--CO--C₁₋₆ alkyl, C₁₋₆ alkyl--CO--O, C₁₋₆ alkyl--CO--C₁₋₆ alkyl-O--, C₁₋₆ alkyl--CO--, C₁₋₆ alkyl--CO--C₁₋₆ alkyl, and the radicals set forth in the definition of R² ;

R⁶ is --NHCOR⁹, --NHCH₂ R⁹, SO₂ R⁸ or one of the radicals set forth in any of the definitions of R², R⁴ and R⁷ ;

R⁸ is oximino (═NOH) or one of the radicals set forth in any of the definitions of R², R⁴ and R⁷ ;

R⁹ is C₁₋₆ alkyl, hydrogen, phenyl or phenylC₁₋₆ alkyl; with the proviso that (a) when m is 0, R⁸ is absent, (b) when R⁴, R⁶, R⁷ or R⁸ is as defined in R², it cannot form together with the carbon to which it is attached, a ring with R⁵, and (c) when R⁴ and R⁷ are attached to the same carbon atom, then either each of R⁴ and R⁷ is independently selected from hydrogen, fluoro and C₁₋₆ alkyl, or R⁴ and R⁷, together with the carbon to which they are attached, for a C₃₋₆ saturated carbocyclic ring that forms a spiro compound with the nitrogen-containing ring to which they are attached.

A particularly preferred compound of formula (V) is (2S,3S)-cis-3-(2-methoxybenzylamino)-2-phenylpiperidine; or a pharmaceutically acceptable salt thereof.

Another class of NK-1 receptor antagonists is as disclosed in PCT International Patent Publication No. WO 93/21155 as compounds of formula (VI): ##STR8## or a pharmaceutically acceptable salt thereof, wherein

radicals R are phenyl radicals optionally 2- or 3-substituted by a halogen atom or a methyl radical;

R¹ is optionally substituted phenyl, cyclohexadienyl, naphthyl, indenyl or optionally substituted heterocycle;

R² is H, halogen, OH, alkyl, aminoalkyl, alkylaminoalkyl, dialkylaminoalkyl, alkyloxy, alkylthio, acyloxy, carboxy, optionally substituted alkyloxycarbonyl, benzyloxycarbonyl, amino or acylamino;

R³ is optionally 2-substituted phenyl;

R⁴ is OH or fluorine when R⁵ is H;

or R⁴ and R⁵ are OH;

or R⁴ and R⁵ together form a bond.

A particularly preferred compound of formula (VI) is (3aS,4S,7aS)-7,7-diphenyl-4-(2-methoxyphenyl)-2-[(2S)-(2-methoxyphenyl)propionyl]perhydroisoindol-4-ol; or a pharmaceutically acceptable salt thereof.

Another class of NK-1 receptor antagonists of use in the present invention is that described in European Patent Publication No. 0 591 040 as compounds of formula (VII): ##STR9## wherein

Ar represents an optionally substituted mono-, di- or tricyclic aromatic or heteroaromatic group;

T represents a bond, a hydroxymethylene group, a C₁₋₄ alkoxymethylene group or a C₁₋₅ alkylene group;

Ar' represents a phenyl group which is unsubstituted or substituted by one or more substituents selected from halogen, preferably chlorine or fluorine, trifluoromethyl, C₁₋₄ alkoxy, C₁₋₄ alkyl where the said substituents may be the same or different; a thienyl group; a benzothienyl group; a naphthyl group; or an indolyl group;

R represents hydrogen, C₁₋₄ alkyl, -C₁₋₄ alkoxyC₁₋₄ alkyl, or -C₂₋₄ alkanoyloxyC₂₋₄ alkyl;

Q represents hydrogen;

or Q and R together form a 1,2-ethylene, 1,3-propylene or 1,4-butylene group;

Am⁺ represents the radical ##STR10## in which X₁, X₂ and X₃, together with the nitrogen atom to which they are attached, form an azabicyclic or azatricyclic ring system optionally substituted by a phenyl or benzyl group; and

A⁻ represents a pharmaceutically acceptable anion.

A particularly preferred compound of formula (VII) is (+)1-[2-[3-(3,4-dichlorophenyl)-1-[(3-isopropoxyphenyl)acetyl]-3-piperidinyl]ethyl]-4-phenyl-1-azabicyclo[2,2,2]octane; or a pharmaceutically acceptable salt, especially the chloride, thereof.

Another class of NK-1 receptor antagonists of use in the present invention is that described in European Patent Publication No. 0 532 456 as compounds of formula (VIII): ##STR11## or a pharmaceutically acceptable salt thereof, wherein

R¹ represents an optionally substituted aralkyl, aryloxyalkyl, heteroaralkyl, aroyl, heteroaroyl, cycloalkylcarbonyl, aralka noyl, heteroarylalkanoyl, aralkoxycarbonyl or arylcarbamoyl group or the acyl group of an (-amino acid optionally N-substituted by a lower alkanoyl or carbamoyl-lower alkanoyl group;

R² represents cycloalkyl or an optionally substituted aryl or heteroaryl group;

R³ represents hydrogen, alkyl, carbamoyl or an alkanoyl or alkenoyl group optionally substituted by carboxy or esterified or amidated carboxy;

R⁴ represents an optionally substituted aryl group or an optionally partially saturated heteroaryl group;

X₁ represents methylene, ethylene, a bond, an optionally ketalised carbonyl group or an optionally etherified hydroxymethylene group;

X₂ represents alkylene, carbonyl or a bond; and

X₃ represents carbonyl, oxo-lower alkyl, oxo(aza)-lower alkyl, or an alkyl group optionally substituted by phenyl, hydroxymethyl, optionally esterified or amidated carboxy, or (in other than the (-position) hydroxy.

A particularly preferred compound of formula (VIII) is (2R*,4S*)-2-benzyl-1-(3,5-dimethylbenzoyl)-N-(4-quinolinylmethyl)-4-piperidineamine; or a pharmaceutically acceptable salt thereof.

Another class of NK-1 receptor antagonists of use in the present invention is that described in European Patent Publication No. 0 443 132 as compounds of formula (IX): ##STR12## or a pharmaceutically acceptable salt thereof, wherein wherein R¹ is aryl, or a group of the formula: ##STR13## or a pharmaceutically acceptable salt thereof, wherein X is CH or N; and

Z is 0 or N--R⁵, in which R⁵ is hydrogen or lower alkyl;

R² is hydroxy or lower alkoxy;

R³ is hydrogen or optionally substituted lower alkyl;

R⁴ is optionally substituted ar(lower)alkyl;

A is carbonyl or sulfonyl; and

Y is a bond or lower alkenylene.

A particularly preferred compound of formula (IX) is the compound of formula (IXa) ##STR14##

Another class of NK-1 receptor antagonists of use in the present invention is that described in PCT International Patent Publication No. WO 92/17449 as compounds of the formula (X): ##STR15## or a pharmaceutically acceptable salt thereof, wherein

R¹ is aryl selected from indanyl, phenyl and naphthyl; heteroaryl selected from thienyl, furyl, pyridyl and quinolyl; and cycloalkyl having 3 to 7 carbon atoms, wherein one of said carbon atoms may optionally be replaced by nitrogen, oxygen or sulfur; wherein each of said aryl and heteroaryl groups may optionally be substituted with one or more substituents, and said C₃₋₇ cycloalkyl may optionally be substituted with one or two substituents, said substituents being independently selected from chloro, fluoro, bromo, iodo, nitro, C₁₋₁₀ alkyl optionally substituted with from one to three fluoro groups, C₁₋₁₀ alkoxy optionally substituted with from one to three fluoro groups, amino, C₁₋₁₀ alkyl-S--, C₁₋₁₀ alkyl-S(O)--, C₁₋₁₀ alkyl-SO₂ --, phenyl, phenoxy, C₁₋₁₀ alkyl-SO₂ NH--, C₁₋₁₀ alkyl-SO₂ NH-C₁₋₁₀ alkyl-, C₁₋₁₀ alkylamino-diC₁₋₁₀ alkyl-, cyano, hydroxy, cycloalkoxy having 3 to 7 carbon atoms, C₁₋₆ alkylamino, C₁₋₆ dialkylamino, HC(O)NH-- and C₁₋₁₀ alkyl-C(O)NH--; and

R² is thienyl, benzhydryl, naphthyl or phenyl optionally substituted with from one to three substituents independently selected from chloro, bromo, fluoro, iodo, cycloalkoxy having 3 to 7 carbon atoms, C₁₋₁₀ alkyl optionally substituted with from one to three fluoro groups and C₁₋₁₀ alkoxy optionally substituted with from one to three fluoro groups.

A particularly preferred compound of formula (X) is (2S,3S)-3-(2-methoxy-5-trifluoromethoxybenzyl)-amino-2-phenylpiperidine; or a pharmaceutically acceptable salt thereof

Another class of NK-1 receptor antagonists of use in the present invention is that described in PCT International Patent Publication No. WO 95/08549 as compounds of formula (XI): ##STR16## wherein R¹ is a C₁₋₄ alkoxy group;

R² is ##STR17##

R³ is a hydrogen or halogen atom;

R⁴ and R⁵ may each independently represent a hydrogen or halogen atom, or a C₁₋₄ alkyl, C₁₋₄ alkoxy or trifluoromethyl group;

R⁶ is a hydrogen atom, a C₁₋₄ alkyl, (CH₂)_(m) cyclopropyl, --S(O)_(n) C₁₋₄ alkyl, phenyl, NR⁷ R⁸, CH₂ C(O)CF₃ or trifluoromethyl group;

R⁷ and R⁸ may each independently represent a hydrogen atom, or a C₁₋₄ alkyl or acyl group;

x represents zero or 1;

n represents zero, 1 or 2;

m represents zero or 1;

and pharmaceutically acceptable salts and solvates thereof.

A particularly preferred compound of formula (XI) is [2-methoxy-5-(5-trifluoromethyl-tetrazol-1-yl)-benzyl]-(2S-phenyl-piperidin-3S-yl)-amine; or a pharmaceutically acceptable salt thereof.

Another class of NK-1 receptor antagonists of use in the present invention is that described in PCT International Patent Publication No. WO 97/49710 as compounds of formula (XII): ##STR18## wherein R¹, R², R³, R⁴, R⁵, R⁶, R⁹, R¹⁰, and X are as defined therein.

Particularly preferred compounds of formula (XII) are

(3S,5R,6S)-3-[2-cyclopropoxy-5-(trifluoromethoxy)phenyl]-6-phenyl-1-oxa-7-aza-spiro[4.5]decane;

(3R,5R,6S)-3-[2-cyclopropoxy-5-(trifluoromethoxy)phenyl]-6-phenyl-1-oxa-7-aza-spiro[4.5]decane; or a pharmaceutically acceptable salt thereof.

Another class of tachykinin receptor antagonists of use in the present invention is that described in PCT International Patent Publication No. WO 95/06645 as compounds of formula (XIII): ##STR19## wherein

R represents a hydrogen atom or a C₁₋₄ alkoxy group;

R¹ is selected from phenyl, optionally substituted by a group --(CH₂)_(n) CONR³ R⁴ or S(O)_(m) R³ ; or a 5- or 6-membered aromatic heterocycle containing 1, 2, 3 or 4 heteroatoms selected from oxygen, nitrogen, or sulphur, optionally substituted by a C₁₋₄ alkyl, trifluoromethyl or cyano group or a group --(CH₂)_(n) CONR³ R⁴ ;

R² represents a hydrogen or halogen atom;

R³ and R⁴ independently represent hydrogen or C₁₋₄ alkyl;

n represents zero, 1 or 2;

m represents zero, 1 or 2;

z represents zero or 1;

and pharmaceutically acceptable salts and solvates thereof

A particularly preferred compound of formula (XII) is [5-(5-methyl-tetrazol-1-yl)-benzofuran-7-ylmethyl]-(2S-phenyl-piperidin-3S-yl)-amine; or a pharmaceutically acceptable salt thereof.

Another class of tachykinin receptor antagonists of use in the present invention is that described in PCT International Patent Publication No. WO 95/14017, i.e. compounds of formula (XIV) ##STR20## or a pharmaceutically acceptable salt thereof, wherein

m is zero, 1, 2 or 3;

n is zero or 1;

o is zero, 1 or2;

p is zero or 1;

R is phenyl, 2- or 3-indolyl, 2- or 3-indolinyl, benzothienyl, benzofuranyl, or naphthyl;

which R groups may be substituted with one or two halo, C₁₋₃ alkoxy, trifluoromethyl, C₁₋₄ alkyl, phenyl-C₁₋₃ alkoxy, or C₁₋₄ alkanoyl groups;

R¹ is trityl, phenyl, diphenylmethyl, phenoxy, phenylthio, piperazinyl, piperidinyl, pyrrolidinyl, morpholinyl, indolinyl, indolyl, benzothienyl, hexamethyleneiminyl, benzofuranyl, tetrahydropyridinyl, quinolinyl, isoquinolinyl, reduced quinolinyl, reduced isoquinolinyl, phenyl-(C₁₋₄ alkyl)-, phenyl-(C₁₋₄ alkoxy)-, quinolinyl-(C₁₋₄ alkyl)-, isoquinolinyl-(C₁₋₄ alkyl)-, reduced quinolinyl-(C₁₋₄ alkyl)-, reduced isoquinolinyl-(C₁₋₄ alkyl)-, benzoyl-(C₁₋₃ alkyl)-, C₁₋₄ alkyl, or --NH--CH₂ --R⁵ ;

any one of which R¹ groups may be substituted with halo, C₁₋₄ alkyl, C₁₋₄ alkoxy, trifluoromethyl, amino, C₁₋₄ alkylamino, di(C₁₋₄ alkyl)amino, or C₂₋₄ alkanoylamino;

or any one of which R¹ groups may be substituted with phenyl, piperazinyl, C₃₋₈ cycloalkyl, benzyl, C₁₋₄ alkyl, piperidinyl, pyridinyl, pyrimidinyl, C₂₋₆ alkanoylamino, pyrrolidinyl, C₂₋₆ alkanoyl, or C₁₋₄ alkoxycarbonyl;

any one of which groups may be substituted with halo, C₁₋₄ alkyl, C₁₋₄ alkoxy, trifluoromethyl, amino, C₁₋₄ alkylamino, di(C₁₋₄ alkyl)amino, or C₂₋₄ alkanoylamino;

or R¹ is amino, a leaving group, hydrogen, C₁₋₄ alkylamino, or di(C₁₋₄ alkyl)amino;

R⁵ is pyridyl, anilino-(C₁₋₃ alkyl)-, or anilinocarbonyl;

R² is hydrogen, C₁₋₄ alkyl, C₁₋₄ alkylsulfonyl, carboxy-(C₁₋₃ alkyl)-, C₁₋₃ alkoxycarbonyl-(C₁₋₃ alkyl)-, or --CO--R⁶ ;

R⁶ is hydrogen, C₁₋₄ alkyl, C₁₋₃ haloalkyl, phenyl, C₁₋₃ alkoxy, C₁₋₃ hydroxyalkyl, amino, C₁₋₄ -alkylamino, di(C₁₋₄ alkyl)amino, or --(CH₂)_(q) --R⁷ ;

q is zero to 3;

R⁷ is carboxy, C₁₋₄ alkoxycarbonyl, C₁₋₄ alkylcarbonyloxy, amino C₁₋₄ alkylamino, di(C₁₋₄ alkyl)amino, C₁₋₆ alkoxycarbonylamino, or phenoxy, phenylthio, piperazinyl, piperidinyl, pyrrolidinyl, morpholinyl, indolinyl, indolyl, benzothienyl, benzofuranyl, quinolinyl, phenyl-(C₁₋₄ alkyl)-, quinolinyl-(C₁₋₄ alkyl)-, isoquinolinyl-(C₁₋₄)-, reduced quinolinyl-(C₁₋₄ alkyl)-, reduced isoquinolinyl-(C₁₋₄ alkyl)-, benzoyl-C₁₋₃ alkyl;

any one of which aryl or heterocyclic R⁷ groups may be substituted with halo, trifluoromethyl, C₁₋₄ alkoxy, C₁₋₄ alkyl, amino, C₁₋₄ alkylamino, di(C₁₋₄ alkyl)amino, or C₂₋₄ alkanoylamino;

or any one of which R⁷ groups may be substituted with phenyl, piperazinyl, C₃₋₈ cycloalkyl, benzyl, piperidinyl, pyridinyl, pyrimidinyl, pyrrolidinyl, C₂₋₆ alkanoyl, or C₁₋₄ alkoxycarbonyl;

any of which groups may be substituted with halo, trifluoromethyl, amino, C₁₋₄ alkoxy, C₁₋₄ alkyl, C₁₋₄ alkylamino, di(C₁₋₄ alkyl)amino, or C₂₋₄ alkanoylamino;

R⁸ is hydrogen or C₁₋₆ alkyl;

R³ is phenyl, phenyl-(C₁₋₆ alkyl)-, C₃₋₈ cycloalkyl, C₅₋₈ cycloalkenyl, C₁₋₈ alkyl, naphthyl, C₂₋₈ alkenyl, or hydrogen;

any one or which groups except hydrogen may be substituted with one or two halo, C₁₋₃ alkoxy, C₁₋₃ alkylthio, nitro, trifluoromethyl, or C₁₋₃ alkyl groups; and

R⁴ is hydrogen or C₁₋₃ alkyl;

with the proviso that if R¹ is hydrogen or halo, R³ is phenyl, phenyl-(C₁₋₆ alkyl)-, C₃₋₈ cycloalkyl, C₅₋₈ cycloalkenyl, or naphthyl.

A particularly preferred compound of formula (XIII) is [N-(2-methoxybenzyl)acetylamino]-3-(1H-indol-3-yl)-2-[N-(2-(4-piperidin-1-yl)piperidin-1-yl)acetylamino]propane; or a pharmaceutically acceptable salt thereof.

The preferred compounds of formulae (I), (II), (III) and (IV) will have the 2- and 3-substituents on the morpholine ring in the cis arrangement, the preferred stereochemistry being as shown in the following general formula: ##STR21##

Where the benzyloxy moiety is α-substituted, the preferred stereochemistry of the α-carbon is either (R) when the substituent is an alkyl (e.g. methyl) group or (S) when the substituent is a hydroxyalkyl (e.g. hydroxymethyl) group.

The preparation of the foregoing compounds is fully described in the referenced patents and publications.

Unless otherwise defined herein, suitable alkyl groups include straight-chained and branched alkyl groups containing from 1 to 6 carbon atoms. Typical examples include methyl and ethyl groups, and straight-chained or branched propyl and butyl groups. Particular alkyl groups are methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl and tert-butyl.

Unless otherwise defined herein, suitable alkenyl groups include straight-chained and branched alkenyl groups containing from 2 to 6 carbon atoms. Typical examples include vinyl and allyl groups.

Unless otherwise defined herein, suitable alkynyl groups include straight-chained and branched alkynyl groups containing from 2 to 6 carbon atoms. Typical examples include ethynyl and propargyl groups.

Unless otherwise defined herein, suitable cycloalkyl groups include groups containing from 3 to 7 carbon atoms. Particular cycloalkyl groups are cyclopropyl and cyclohexyl.

Unless otherwise defined herein, suitable aryl groups include phenyl and naphthyl groups. A particular aryl-C₁₋₆ alkyl, e.g. phenyl-C₁₋₆ alkyl, group is benzyl.

Unless otherwise defined herein, suitable heteroaryl groups include pyridyl, quinolyl, isoquinolyl, pyridazinyl, pyrimidinyl, pyrazinyl, pyranyl, furyl, benzofuryl, thienyl, benzthienyl, imidazolyl, oxadiazolyl and thiadiazolyl groups.

The term "halogen" as used herein includes fluorine, chlorine, bromine and iodine. The compounds of use in this invention may have one or more asymmetric centres and can therefore exist as enantiomers and possibly as diastereoisomers. It is to be understood that the present invention relates to the use of all such isomers and mixtures thereof.

Suitable pharmaceutically acceptable salts of the NK-1 receptor antagonists of use in the present invention include acid addition salts which may, for example, be formed by mixing a solution of the compound with a solution of a pharmaceutically acceptable non-toxic acid such as hydrochloric acid, fumaric acid, maleic acid, succinic acid, acetic acid, citric acid, tartaric acid, carbonic acid, phosphoric acid or sulphuric acid. Salts of amine groups may also comprise the quaternary ammonium salts in which the amino nitrogen atom carries an alkyl, alkenyl, alkynyl or aralkyl group. Where the compound carries an acidic group, for example a carboxylic acid group, the present invention also contemplates salts thereof, preferably non-toxic pharmaceutically acceptable salts thereof, such as the sodium, potassium and calcium salts thereof.

The above compounds are only illustrative of the neurokinin-1 (NK-1) antagonists which are currently under investigation. As this listing of compounds is not meant to be comprehensive, the methods of the present invention may employ any neurokinin-1 receptor antagonist, in particular a neurokinin-1 receptor antagonist which is orally active, long acting and CNS-penetrant. Accordingly, the present invention is not strictly limited to any particular structural class of compound.

Certain of the above defined terms may occur more than once in the above formula and upon such occurrence each term shall be defined independently of the other. Similarly, the use of a particular variable within a noted structural formula is intended to be independent of the use of such variable within a different structural formula.

Full descriptions of the preparation of the tachykinin receptor antagonists which are employed in the present invention may be found in the references cited herein.

The present invention accordingly provides the use of a NK-1 receptor antagonist selected from the compounds of formulae (I), (II), (III), (IV), (V), (VI), (VII), (VIII), (IX), (X), (XI), (XII), (XIII) and (XIV) for the manufacture of a medicament for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient.

The present invention also provides a method for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient, which method comprises administration to a patient in need of such treatment an effective amount of a NK-1 receptor antagonist selected from the compounds of formulae (I), (II), (III), (IV), (V), (VI), (VII), (VIII), (IX), (X), (XI), (XII), (XIII) and (XIV).

In a further aspect of the present invention, there is provided a pharmaceutical composition for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient comprising a NK-1 receptor antagonist selected from the compounds of formulae (I), (II), (III), (IV), (V), (VI), (VII), (VIII), (IX), (X) (XI), (XII), (XIII) and (XIV), together with at least one pharmaceutically acceptable carrier or excipient.

The identification of a compound as a tachykinin receptor antagonist, in particular, a neurokinin-1 receptor antagonist, and thus able to have utility in the present invention may be readily determined without undue experimentation by methodology well known in the art.

It is well recognized in the art that psychological stimuli can precipitate or alter the course of numerous diseases or disorders. As used herein a "psychosomatic disorder" is a disease or disorder for which the physical etiology is contributed to directly or indirectly by psychological factors. As used herein a "psychoimmunologic disorder" is an immunologic disease or disorder wherein an immunological response is influenced directly or indirectly by psychological factors.

Accordingly, the present invention provides methods for the treatment or prevention of a psychosomatic disorder or a psychoimmunologic disorder wherein the physical etiology or immunological response is contributed to directly or indirectly by psychological factors in the origin or progression of diseases and disorders such as alopecia areata, angina pectoris nervosa, asthma, atopoic dermatitis, autonomic imbalance, bacterial infections, bronchial asthma, cancer, cerebrovascular disease, collage vascular diseases, diabetes mellitus, duodenal ulcer, dyspnoeneurosis, essential hypertension, gastric ulcer, hypersensitive skin response, hypertension, inflammatory skin disorders, leukemia, malignancy, multiple sclerosis, myocardial infarction, neurodermatitis, neurotic emesis, peptic ulcer, psoriasis, puritis, respiratory illness, rheumatoid arthritis, systemic lupus erythematosus, thyrotoxicosis, ulcreative colitis, varicella zoster, and viral infection. As will be readily appreciated by one skilled in the art, psychological pressures which contribute to the clinical course of such psychosomatic or psychoimmunologic diseases and disorders may be only a contributing factor to the penultimate state of the disorder or disease. In addition, the psychological pressures which contribute to the clinical course of such psychosomatic or psychoimmunologic diseases and disorders interact with numerous other factors, including the patient's hereditary predisposition, personality features, and the autonomic and endocrine effects that arise in response to individual vicissitudes.

A tachykinin receptor antagonist may be administered alone or in combination by oral, parenteral (e.g., intramuscular, intraperitoneal, intravenous or subcutaneous injection, or implant), nasal, vaginal, rectal, sublingual, or topical routes of administration and can be formulated in dosage forms appropriate for each route of administration.

Preferably the compositions according to the present invention are in unit dosage forms such as tablets, pills, capsules, powders, granules, solutions or suspensions, or suppositories, for oral, parenteral or rectal administration, by inhalation or insufflation or administration by trans-dermal patches or by buccal cavity absorption wafers.

For preparing solid compositions such as tablets, the principal active ingredient is mixed with a pharmaceutical carrier, e.g. conventional tableting ingredients such as corn starch, lactose, sucrose, sorbitol, talc, stearic acid, magnesium stearate, dicalcium phosphate or gums, and other pharmaceutical diluents, e.g. water, to form a solid preformulation composition containing a homogeneous mixture of a compound of the present invention, or a non-toxic pharmaceutically acceptable salt thereof When referring to these preformulation compositions as homogeneous, it is meant that the active ingredient is dispersed evenly throughout the composition so that the composition may be readily subdivided into equally effective unit dosage forms such as tablets, pills and capsules. This solid preformulation composition is then subdivided into unit dosage forms of the type described above containing from 0.1 to about 500 mg of the active ingredient of the present invention. The tablets or pills of the novel composition can be coated or otherwise compounded to provide a dosage form affording the advantage of prolonged action. For example, the tablet or pill can comprise an inner dosage and an outer dosage component, the latter being in the form of an envelope over the former. The two components can be separated by an enteric layer which serves to resist disintegration in the stomach and permits the inner component to pass intact into the duodenum or to be delayed in release. A variety of materials can be used for such enteric layers or coatings, such materials including a number of polymeric acids and mixtures of polymeric acids with such materials as shellac, cetyl alcohol and cellulose acetate.

The liquid forms in which the novel compositions of the present invention may be incorporated for administration orally or by injection include aqueous solutions, suitably flavoured syrups, aqueous or oil suspensions, and flavoured emulsions with edible oils such as cottonseed oil, sesame oil, coconut oil, peanut oil or soybean oil, as well as elixirs and similar pharmaceutical vehicles. Suitable dispersing or suspending agents for aqueous suspensions include synthetic and natural gums such as tragacanth, acacia, alginate, dextran, sodium carboxymethylcellulose, methylcellulose, polyvinyl-pyrrolidone or gelatin.

Preferred compositions for administration by injection include those comprising a NK-1 receptor antagonist as the active ingredient, in association with a surface-active agent (or wetting agent or surfactant) or in the form of an emulsion (as a water-in-oil or oil-in-water emulsion).

Suitable surface-active agents include, in particular, non-ionic agents, such as polyoxyethylenesorbitans (e.g. Tween™ 20, 40, 60, 80 or 85) and other sorbitans (e.g. Span™ 20, 40, 60, 80 or 85). Compositions with a surface-active agent will conveniently comprise between 0.05 and 5% surface-active agent, and preferably between 0.1 and 2.5%. It will be appreciated that other ingredients may be added, for example mannitol or other pharmaceutically acceptable vehicles, if necessary.

Suitable emulsions may be prepared using commercially available fat emulsions, such as Intralipid™, Liposyn™, Infonutrol™, Lipofindin™ and Lipiphysan™. The active ingredient may be either dissolved in a pre-mixed emulsion composition or alternatively it may be dissolved in an oil (e.g. soybean oil, safflower oil, cottonseed oil, sesame oil, corn oil or almond oil) and an emulsion formed upon mixing with a phospholipid (e.g. egg phospholipids, soybean phospholipids or soybean lecithin) and water. It will be appreciated that other ingredients may be added, for example glycerol or glucose, to adjust the tonicity of the emulsion. Suitable emulsions will typically contain up to 20% oil, for example, between 5 and 20%. The fat emulsion will preferably comprise fat droplets between 0.1 and 1.0 μm, particularly 0.1 and 0.5μm, and have a pH in the range of 5.5 to 8.0.

Compositions for inhalation or insufflation include solutions and suspensions in pharmaceutically acceptable, aqueous or organic solvents, or mixtures thereof, and powders. The liquid or solid compositions may contain suitable pharmaceutically acceptable excipients as set out above. Preferably the compositions are administered by the oral or nasal respiratory route for local or systemic effect. Compositions in preferably sterile pharmaceutically acceptable solvents may be nebulised by use of inert gases. Nebulised solutions may be breathed directly from the nebulising device or the nebulising device may be attached to a face mask, tent or intermittent positive pressure breathing machine. Solution, suspension or powder compositions may be administered, preferably orally or nasally, from devices which deliver the formulation in an appropriate manner.

Compositions of the present invention may also be presented for administration in the form of trans-dermal patches using conventional technology. The compositions may also be administered via the buccal cavity using, for example, absorption wafers.

Compositions in the form of tablets, pills, capsules or wafers for oral administration are particularly preferred.

It will be known to those skilled in the art that there are numerous compounds which may be used for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder in a patient. Combinations of these therapeutic agents some of which have also been mentioned herein with a tachykinin receptor antagonist will bring additional, complementary, and often synergistic properties to enhance the desirable properties of these various therapeutic agents. In these combinations, the tachykinin receptor antagonist and the therapeutic agents may be independently present in dose ranges from one one-hundredth to one times the dose levels which are effective when these compounds are used singly. In such combination therapy, the tachykinin receptor antagonist may be administered with the other therapeutic agent (e.g., concurrently, concombinantly, sequentially, or in a unitary formulation) such that their therapeutic efficacy overlap.

The tachykinin receptor antagonist may be administered in combination with stimulants, hypnotics, anxiolytics, antipsychotics, antianxiety agents, minor tranquilizers, benzodiazepines, barbituates, serotonin agonists, selective serotonin reuptake inhibitors, 5HT-2 antagonists, non-steroidal anti-inflammatory drugs, oral contraceptives, progesterone, progestin, monoamine oxidase inhibitors, and the like, or the tachykinin receptor antagonist may be administered in conjunction with the use of physical methods such as electrical stimulation.

For example, for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder in a patient a tachykinin receptor antagonist may be given in combination with such compounds as: adinazolam, allobarbital, alonimid, alprazolam, amitriptyline, amobarbital, amoxapine, bentazepam, benzoctamine, brotizolam, bupropion, busprione, butabarbital, butalbital, caffeine, capuride, carbocloral, chloral betaine, chloral hydrate, chlordiazepoxide, clomipramine, cloperidone, clorazepate, clorethate, clozapine, cyprazepam, deanol, desipramine, dexclamol, dextroamphetamine, diazepam, dichloralphenazone, divalproex, diphenhydramine, doxepin, estazolam, ethchlorvynol, etomidate, fenobam, flunitrazepam, flurazepam, fluvoxamine, fluoxetine, fosazepam, glutethimide, halazepam, hydroxyzine, imipramine, lithium, lorazepam, lormetazepam, maprotiline, mecloqualone, melatonin, mephobarbital, meprobamate, methaqualone, methylphenidate, midaflur, midazolam, nefazodone, nisobamate, nitrazepam, nortriptyline, oxazepam, paraldehyde, paroxetine, pemoline, pentobarbital, perlapine, perphenazine, phenelzine, phenobarbital, prazepam, promethazine, propofol, protriptyline, quazepam, reclazepam, roletamide, secobarbital, sertraline, suproclone, temazepam, thioridazine, tracazolate, tranylcypromaine, trazodone, triazolam, trepipam, tricetamide, triclofos, trifluoperazine, trimetozine, trimipramine, uldazepam, valproate, venlafaxine, zaleplon, zolazepam, zolpidem, and salts thereof, and combinations thereof, and the like, as well as admixtures and combinations thereof.

Typically, the individual daily dosages for these combinations may range from about one-fifth of the minimally recommended clinical dosages to the maximum recommended levels for the entities when they are given singly. In the case of methylphenidate the recommended clinical dose is generally from approximately 5 mg/day to approximately 20 mg/day, however, the dosage may be titrated, beginning at low doses and increasing to optimal levels (decrease in symptoms, improvement in task performance, and no side effects).

To illustrate these combinations, a tachykinin receptor antagonist effective clinically at a given daily dose range may be effectively combined, at levels which are equal or less than the daily dose range, with the aforementioned compounds. It will be readily apparent to one skilled in the art that the tachykinin receptor antagonist may be employed with other agents for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient.

Naturally, these dose ranges may be adjusted on a unit basis as necessary to permit divided daily dosage and, as noted above, the dose will vary depending on the nature and severity of the disease, weight of patient, special diets and other factors. These combinations may be formulated into pharmaceutical compositions as known in the art and as discussed herein.

The dosage of active ingredient in the compositions of this invention may be varied, however, it is necessary that the amount of the active ingredient be such that a suitable dosage form is obtained. The active ingredient may be administered to patients (animals and human) in need of such treatment in dosages that will provide optimal pharmaceutical efficacy. The selected dosage depends upon the desired therapeutic effect, on the route of administration, and on the duration of the treatment. The dose will vary from patient to patient depending upon the nature and severity of disease or disorder, the patient's weight, special diets then being followed by a patient, concurrent medication, the intrinsic tachykinin receptor antagonist activity of the compound, the bioavailability upon oral administration of the compound and other factors which those skilled in the art will recognize.

In the treatment of a condition in accordance with the present invention, an appropriate dosage level will generally be about 0.01 μg to 50 mg per kg patient body weight per day which may be administered in single or multiple doses. Preferably, the dosage level will be about 0.1 μg to about 25 mg/kg per day; more preferably about 0.5 μg to about 10 mg/kg per day. For example, for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient, a suitable dosage level is about 0.1 μg to 25 mg/kg per day, preferably about 0.5 μg to 10 mg/kg per day, and especially about 1 μg to 5 mg/kg per day. In larger mammals, for example humans, a typical indicated dose is about 300 μg to 400 mg orally. A compound may be administered on a regimen of several times per day, for example 1 to 4 times per day, preferably once or twice per day. When using an injectable formulation, a suitable dosage level is about 0.1 μg to 10 mg/kg per day, preferably about 0.5 μg to 5 mg/kg per day, and especially about 1 μg to 1 mg/kg per day. In larger mammals, for example humans, a typical indicated dose is about 100 μg to 100 mg i.v. A compound may be administered on a regimen of several times per day, for example 1 to 4 times per day, preferably once or twice per day, and more preferably once a day.

Pharmaceutical compositions of the present invention may be provided in a solid dosage formulation preferably comprising about 100 μg to 500 mg active ingredient, more preferably comprising about 100 μg to 250 mg active ingredient. The pharmaceutical composition is preferably provided in a solid dosage formulation comprising about 100 μg, 1 mg, 5 mg, 10 mg, 25 mg, 50 mg, 100 mg, 200 mg or 300 mg active ingredient. A minimum dosage level for the NK-1 receptor antagonist is generally about 5 mg per day, preferably about 10 mg per day and especially about 20 mg per day. A maximum dosage level for the NK-1 receptor antagonist is generally about 1500 mg per day, preferably about 1000 mg per day and especially about 500 mg per day.

It will be appreciated that the amount of the NK-1 receptor antagonist required for use in treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient will vary not only with the particular compounds or compositions selected but also with the route of administration, the nature of the condition being treated, and the age and condition of the patient, and will ultimately be at the discretion of the patient's physician or pharmacist. The length of time during which a tachykinin receptor antagonist will be given varies on an individual basis.

The compounds of formulae (I), (II), (III), (IV), (V), (VI), (VI), (VII), (IX), (X), (XI), (XII), (XIII) and (XIV) may be prepared by the methods described in EP-A-0 577 394 (or WO 95/16679), WO 95/18124, WO 95/23798, WO 96/05181, EP-A-0 436 334, WO 93/21155, EP-A-0 591 040, EP-A-0 532 456, EP-A-0 443 132, WO 92/17449, WO 95/08549, WO 97/49710, WO 95/06645 and WO 95/14017, respectively.

Particularly preferred NK-1 receptor antagonists of the formulae (I), (II), (III), (IV), (V), (VI), (VII), (VIII), (IX), (X), (XI), (XII), (XIII) and (XIV) for use in the present invention are compounds which are potent NK-1 receptor antagonists, i.e. compounds with an NK-1 receptor affinity (IC₅₀) of less than 10 nM.

A particularly preferred class of NK-1 receptor antagonist of use in the present invention are those compounds which are orally active, long acting and CNS-penetrant. Such compounds may be identified using the pharmacological assays described hereinafter. The use of this sub-class of NK-1 antagonists for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient represents a further aspect of the present invention.

Thus, the present invention provides the use of a CNS penetrant NK-1 receptor antagonist in an oral, once-a-day medicament for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient. The compounds of this class advantageously exhibit a rapid onset of action and a reduced side-effect profile when compared against conventional methods for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder in a patient.

In particular, the present invention provides a means for the identification of NK-1 receptor antagonists which would be especially effective in an oral once-a-day medicament for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient.

The exceptional pharmacology of the class of NK-1 receptor antagonists of use in the present invention enables treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient, without the need for concomitant therapy and in particular, without the need for concomitant use of a serotonin agonist or an SSRI.

Furthermore, the exceptional pharmacology of the class of NK-1 receptor antagonists of use in the present invention results in a rapid onset of action.

The present invention accordingly provides the use of an orally active, long acting, CNS-penetrant NK-1 receptor antagonist (as hereinafter defined) for the manufacture of a medicament adapted for oral administration for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient.

The present invention also provides a method for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient, which method comprises the oral administration to a patient in need of such treatment of an effective amount of an orally active, long acting, CNS-penetrant NK-1 receptor antagonist (as defined herein).

In a further aspect of the present invention, there is provided an oral pharmaceutical composition for treating or preventing a psychosomatic disorder or a psychoimmunologic disorder or ameliorating the symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder in a patient which comprises an orally active, long acting, CNS-penetrant NK-1 receptor antagonist (as hereinafter defined), together with a pharmaceutically acceptable carrier or excipient.

It will be appreciated to those skilled in the art that reference herein to treatment extends to prophylaxis (prevention) as well as the treatment of the noted diseases/disorders and symptoms. Because the specific diagnosis of a psychosomatic disorder or a psychoimmunologic disorder in a particular patient may be difficult, the patient may benefit from the prophylactic administration of a subject compound in accordance with the present invention.

Preferred NK-1 receptor antagonists for use in the present invention as orally active, long acting, CNS-penetrant NK-1 receptor antagonists are selected from the classes of compounds described in European Patent Specification No. 0 577 394, and International Patent Specification Nos. 95/08549, 95/18124, 95/23798, 96/05181 and WO 97/49710.

Particularly preferred NK-1 receptor antagonists of use in the present invention include:

(±)-(2R³ R,2S3S)-N-{[2-cyclopropoxy-5-(trifluoromethoxy)phenyl]methyl}-2-phenylpiperidin-3-amine;

2-(S)-(3,5-bis(trifluoromethyl)benzyloxy)-3(S)-(4-fluorophenyl)-4-(3-(5-oxo-1H,4H-1,2,4-triazolo)methyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(3-(5-oxo-1H,4H-1,2,4-triazolo)methyl)-3-(S)-phenyl-morpholine;

2-(S)-(3,5-bis(trifluoromethyl)benzyloxy)-4-(3-(5-oxo-1H,4H-1,2,4-triazolo)methyl)-3-(S)-phenyl-morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(5-oxo-1H,4H-1,2,4-triazolo)methyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(5-(N,N-dimethylamino)methyl-1,2,3-triazol-4-yl)methyl-3-(S)-phenylmorpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(5-(N,N-dimethylamino)methyl-1,2,3-triazol-4-yl)methyl-3-(S)-(4-fluorophenyl)morpholine;

(3S,5R,6S)-3-[2-cyclopropoxy-5-(trifluoromethoxy)phenyl]-6-phenyl-1-oxa-7-aza-spiro[4.5]decane;

(3R,5R,6S)-3-[2-cyclopropoxy-5-(trifluoromethoxy)phenyl]-6-phenyl-1-oxa-7-aza-spiro[4.5]decane;

2-(R)-(1-(S)-(3,5-bis(trifluoromethyl)phenyl)-2-hydroxyethoxy)-3-(S)-(4-fluorophenyl)-4-(1,2,4-triazol-3-yl)methylmorpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(4-monophosphoryl-5-oxo-1H-1,2,4-triazolo)methyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(1-monophosphoryl-5-oxo-1H-1,2,4-triazolo)methyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(2-monophosphoryl-5-oxo-1H-1,2,4-triazolo)methyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(5-oxyphosphoryl-1H-1,2,4-triazolo)methyl)morpholine;

2-(S)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(1-monophosphoryl-5-oxo-4H-1,2,4-triazolo)methyl)morpholine;

2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-(4-N,N-dimethylaminobut-2-yn-yl)-3-(S)-(4-fluorophenyl)morpholine; or a pharmaceutically acceptable salt thereof.

Full descriptions of the preparation of the tachykinin receptor antagonists which may be employed in the present invention may be found in the references cited herein.

The following examples are provided for the purpose of further illustration only and are not intended to be limitations on the disclosed invention.

EXAMPLE 1 NK-1 Receptor binding Assay

NK-1 receptor binding assays are performed in intact Chinese hamster ovary (CHO) cells expressing the human NK-1 receptor using a modification of the assay conditions described by Cascieri et al, J. Pharmacol. Exp. Ther., 1992, 42, 458. Typically, the receptor is expressed at a level of 3×10⁵ receptors per cell. Cells are grown in monolayer culture, detached from the plate with enzyme-free dissociation solution (Speciality Media Inc.), and washed prior to use in the assay. ¹²⁵ I-Tyr⁸ I-substance P (0.1 nM, 2000 Ci/mmol; New England Nuclear) is incubated in the presence or absence of test compounds (dissolved in 5 μl dimethylsulphoxide, DMSO) with 5×10⁴ CHO cells. Ligand binding is performed in 0.25 ml of 50 mM Tris-HCl, pH7.5, containing 5 mM MnCl₂, 150 mM NaCl, 0.02% bovine serum albumin (Sigma), 50 μg/ml chymostatin (Peninsula), 0.1 nM phenylmethylsulphonyl fluoride, 2 μg/ml pepstatin, 2 μg/ml leupeptin and 2.8 μg/ml furoyl saccharine. The incubation proceeds at room temperature until equilibrium is achieved (>40 minutes) and the receptor-ligand complex is harvested by filtration over GF/C filters pre-soaked in 0.1% polyethylenimine using a Tomtek 96-well harvester. Non-specific binding is determined using excess substance P (1 μM) and represents <10% of total binding.

EXAMPLE 2 Gerbil Foot-Tapping Assay

CNS penetrant NK-1 receptor antagonists for use in the present invention can be identified by their ability to inhibit foot tapping in gerbils induced by anxiogenic agents (such as pentagastrin) or central infusion of NK-1 receptor agonists such as GR73632, or caused by aversive stimulation such as foot shock or single housing, based on the method of Rupniak & Williams, Eur. J. Pharmacol., 1994, 265, 179.

Male or female Mongolian gerbils (35-70 g) are anaesthetised by inhalation of an isoflurane/oxygen mixture to permit exposure of the jugular vein in order to permit administration of test compounds or vehicle in an injection volume of 5 ml/kg i.v. Alternatively, test compounds may be administered orally or by subcutaneous or intraperitoneal routes. The wound is closed and a second skin incision is made in the midline of the scalp to expose the skull. An anxiogenic agent (e.g. pentagastrin) or a selective NK-1 receptor agonist (e.g. GR73632 (d Ala[L-Pro⁹,Me-Leu¹⁰ ]-substance P-(7-11))) is infused directly into the cerebral ventricles (e.g. 3 pmol in 5 μl i.c.v. depending upon the agent) by vertical insertion of a cuffed 27 gauge needle to a depth of 4.5 mm below bregma. The scalp incision is closed and the animal allowed to recover from anaesthesia in a clear perspex observation box (25 cm×20 cm×20 cm). The duration and/or intensity of hind foot tapping is then recorded continuously for 5 minutes. Alternatively, the ability of test compounds to inhibit foot tapping evoked by aversive stimulation, such as foot shock or single housing, may be studied using a similar method of quantification.

EXAMPLE 3 Ferret Emesis Assay

Individually housed male ferrets (1.0-2.5 kg) are dosed orally by gavage with test compound. Ten minutes later they are fed with approximately 100 g of tinned cat food. At 60 minutes following oral dosing, cisplatin (10 mg/kg) is given i.v. via a jugular vein catheter inserted under a brief period of halothane anaesthesia. The catheter is then removed, the jugular vein ligated and the skin incision closed. The ferrets recover rapidly from the anaesthetic and are mobile within 10-20 minutes. The animals are observed continuously during recovery from the anaesthetic and for 4 hours following the cisplatin injection, after which time the animals are killed humanely. The numbers of retches and vomits occurring during the 4 hours after cisplatin administration are recorded by trained observers.

EXAMPLE 4 Separation-Induced Vocalisation Assay

Male and female guinea-pigs pups are housed in family groups with their mothers and littermates throughout the study. Experiments are commenced after weaning when the pups are 2 weeks old. Before entering an experiment, the pups are screened to ensure that a vigorous vocalisation response is reproducibly elicited following maternal separation. The pups are placed individually in an observation cage (55 cm×39 cm×19 cm) in a room physically isolated from the home cage for 15 minutes and the duration of vocalisation during this baseline period is recorded. Only animals which vocalise for longer than 5 minutes are employed for drug challenge studies (approximately 50% of available pups may fail to reach this criterion). On test days each pup receives an oral dose or a s.c. or i.p. injection of test compound or vehicle and is then immediately returned to the home cage with its mother and siblings for 30 minutes to 60 minutes (or for up to 4 hours following an oral dose, dependant upon the oral pharmacokinetics of the test compound) before social isolation for 15 minutes as described above. The duration of vocalisation on drug treatment days is expressed as a percentage of the pre-treatment baseline value for each animal. The same subjects are retested once weekly for up to 6 weeks. Between 6 and 8 animals receive each test compound at each dose tested.

A suitable selection cascade for NK₁ antagonists of use according to the present invention is as follows:

(i) Determine affinity for human NK₁ receptor in radioligand binding studies (Assay 1); select compounds with IC₅₀ ≦10 nM, preferably IC₅₀ ≦2nM, especially IC₅₀ ≦1 nM.

(ii) Determine ability of compounds to penetrate CNS by their ability to inhibit foot tapping in gerbils induced by central injection of an NK₁ agonist (Assay 2); select compounds that inhibit foot tapping with ID₅₀ ≦3 mg/kg i.v., and preferably ID₅₀ ≦1 mg/kg i.v. when administered immediately prior to central NK₁ agonist challenge, or ID₅₀ ≦30 mg/kg p.o., and preferably ID₅₀ ≦10 mg/kg p.o. 1 hour prior to challenge.

(iii) Determine central duration of action of compounds in gerbil foot tapping assay following intravenous administration 24 hours prior to central NK₁ agonist challenge; select compounds showing ≦25-fold loss of potency compared with ID₅₀ determined in step (ii) above with the proviso that ID₅₀ ≦10 mg/kg i.v., and preferably ≦5 mg/kg i.v. after 24 hour pre-treatment.

(iv) Determine oral bioavailability of compounds by pharmacokinetic analysis, activity in gerbil foot tapping assay following oral administration and/or by ability to inhibit cisplatin-induced emesis in ferrets (Assay 3); select compounds with ID₉₀ ≦3 mg/kg p.o., and preferably ID₉₀ ≦1 mg/kg p.o.

Particularly preferred compounds of use in the present invention are identified using steps (i) to (iv) followed by step (v):

(v) Determine activity of compounds in assays sensitive to conventional antidepressant drugs (inhibition of pharmacologically evoked foot tapping in gerbils and/or inhibition of distress vocalisations in guinea-pig pups (Assay 4)). Select compounds with ID₅₀ ≦20 mg/kg, and preferably ID₅₀ ≦10 mg/kg.

Yet further preferred compounds of use in the present invention may be selected from those compounds which satisfy the NK-1 receptor binding criteria of step (i) which, in addition, have ≦5-fold shift in affinity when incubated in the presence of human serum albumin (HSA) to show non-specific protein binding.

One example of a NK-1 receptor antagonist of use in the present invention is the compound 2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)-ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(5-oxo-1H,4H-1,2,4-triazolo)methyl)-morpholine, the preparation of which is described in PCT Patent Publication No. WO 95/16679. In the aforementioned assays, this compound has the following activity:

human NK-1 receptor binding: IC₅₀ =0.1 nM

gerbil foot-tapping (5 mins.): ID₅₀ =0.36 mg/kg i.v.

gerbil foot-tapping (24 hrs.): ID₅₀ =0.33 mg/kg i.v.

ferret emesis: ID₉₀ ≦3 mg/kg p.o.

guinea-pig vocalisation ID₅₀ =0.73 mg/kg p.o.

(4hr. pre-treatment):

The following example illustrates pharmaceutical compositions according to the invention.

EXAMPLE 5

    ______________________________________                                         Tablet formulation containing 50-300 mg of NK-1 antagonist                                   Amount mg                                                        ______________________________________                                         NK-1 antagonist 50.0       100.0   300.0                                       Microcrystalline cellulose                                                                     80.0       80.0     80.0                                       Modified food corn starch                                                                      80.0       80.0     80.0                                       Lactose         189.5      139.5   439.5                                       Magnesium Stearate                                                                              0.5        0.5     0.5                                        ______________________________________                                    

The active ingredient; cellulose, lactose and a portion of the corn starch are mixed and granulated with 10% corn starch paste. The resulting granulation is sieved, dried and blended with the remainder of the corn starch and the magnesium stearate. The resulting granulation is then compressed into tablets containing 50 mg, 100 mg and 300 mg of the NK-1 receptor antagonist per tablet.

EXAMPLE 6

    ______________________________________                                         Parenteral injection formulation                                                              Amount                                                          ______________________________________                                         Active Ingredient                                                                               10 to 300     mg                                              Citric Acid Monohydrate                                                                         0.75          mg                                              Sodium Phosphate 4.5           mg                                              Sodium Chloride  9             mg                                              Water for injection                                                                             to 10         ml                                              ______________________________________                                    

The sodium phosphate, citric acid monohydrate and sodium chloride are dissolved in a portion of the water. The active ingredient is dissolved or suspended in the solution and made up to volume.

EXAMPLE 7

Double-Blind, Placebo-Controlled Study to Determine the Effect of a Neurokinin-1 Antagonist on Patients Suffering from a Psychosomatic Disorder or a Psychoimmunologic Disorder

Approximately twenty patients suffering from a psychosomatic disorder or a psychoimmunologic disorder receive either the neurokinin-1 receptor antagonist 2-(R)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)-ethoxy)-3-(S)-(4-fluorophenyl)-4-(3-(5-oxo-1H,4H-1,2,4-triazolo)methyl-morpholine (30 mg/day) or a placebo. Each subject participates in 6 randomized test periods; in 3 of the test periods, each is given the substance P antagonist and in the other 3 test periods, is given a placebo. Efficacy of the test compound is assessed by reference to immunological profile, rating scales, checklists and diminishment of the attendant disease state. The results of the foregoing study would indicate that the administration of a neurokinin-1 receptor antagonist would be expected to have a positive effect with respect to placebo in the treatment or prevention of a psychosomatic disorder or a psychoimmunologic disorder or tbe amelioration of symptoms attendant to a psychosomatic disorder or a psychoimmunologic disorder following drug treatment.

While the invention has been described and illustrated with reference to certain particular embodiments thereof, those skilled in the art will appreciate that various adaptations, changes, modifications, substitutions, deletions, or additions of procedures and protocols may be made without departing from the spirit and scope of the invention. For example, effective dosages other than the particular dosages as set forth herein above may be applicable as a consequence of variations in the responsiveness of the mammal being treated for any of the indications with the compounds of the invention indicated above. Likewise, the specific pharmacological responses observed may vary according to and depending upon the particular active compounds selected or whether there are present pharmaceutical carriers, as well as the type of formulation and mode of administration employed, and such expected variations or differences in the results are contemplated in accordance with the objects and practices of the present invention. It is intended, therefore, that the invention be defined by the scope of the claims which follow and that such claims be interpreted as broadly as is reasonable. 

What is claimed is:
 1. A method for the treatment or prevention of a psychoimmunologic disorder in a patient which comprises administering an effective amount of a tachykinin receptor antagonist.
 2. The method of claim 1 wherein the tachykinin receptor antagonist is a neurokinin-1 receptor antagonist.
 3. The method of claim 2 wherein the neurokinin-1 receptor antagonist is a CNS-penetrating neurokinin-1 receptor antagonist.
 4. The method of claim 3 wherein the neurokinin-1 receptor antagonist is an orally active neurokinin-1 receptor antagonist.
 5. The method of claim 4 wherein the neurokinin-1 receptor antagonist possesses a long duration of action.
 6. The method of claim 1 wherein the neurokinin-1 receptor antagonist is a non-peptidal neurokinin-1 receptor antagonist.
 7. A method for the treatment or prevention of a psychoimmunologic disorder in a patient by diminishing the detrimental influence of psychological stimuli on the immunological state of the patient which comprises administering to the patient in need thereof an effective amount of a neurokinin-1 receptor antagonist.
 8. The method of claim 7 wherein the neurokinin-1 receptor antagonist is a CNS-penetrating neurokinin-1 receptor antagonist.
 9. The method of claim 8 wherein the neurokinin-1 receptor antagonist is an orally active neurokinin-1 receptor antagonist.
 10. The method of claim 9 wherein the neurokinin-1 receptor antagonist possesses a long duration of action.
 11. The method of claim 7 wherein the neurokinin-1 receptor antagonist is a non-peptidal neurokinin-1 receptor antagonist.
 12. A method for the treatment or prevention of a psychoimmunologic disorder in a patient wherein the origin or progression of the psychoimmunologic disorder is directly or indirectly contributed to by psychological stimuli which comprises administering to the patient in need thereof an effective amount of a neurokinin-1 receptor antagonist.
 13. The method of claim 12 wherein the neurokinin-1 receptor antagonist is a CNS-penetrating neurokinin-1 receptor antagonist.
 14. The method of claim 13 wherein the neurokinin-1 receptor antagonist is an orally active neurokinin-1 receptor antagonist.
 15. The method of claim 14 wherein the neurokinin-1 receptor antagonist possesses a long duration of action.
 16. The method of claim 12 wherein the neurokinin-1 receptor antagonist is a non-peptidal neurokinin-1 receptor antagonist. 